12583 + Mcqs in Physics Page 83 McqOptions

4101.	A photon of energy 8 eV is incident on metal surface of threshold frequency \[1.6\times {{10}^{15}}Hz.\] The maximum kinetic energy of the photoelectrons emitted (in eV) (Take \[h=6\times {{10}^{-34}}Js)\]. [MP. PET 2005]
A.	1.6
B.	6
C.	2
D.	1.2
Answer» D. 1.2

Discussion

4102.	The incident photon involved in the photoelectric effect experiment. [EAMCET 2005]
A.	Completely disappears
B.	Comes out with an increased frequency
C.	Comes out with a decreased frequency
D.	Comes out without change in frequency
Answer» B. Comes out with an increased frequency

Discussion

4103.	The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons [BHU 2005]
A.	3 eV
B.	1.2 eV
C.	0.6 eV
D.	1.4 eV
Answer» D. 1.4 eV

Discussion

4104.	The magnitude of saturation photoelectric current depends upon [AFMC 2005]
A.	Frequency
B.	Intensity
C.	Work function
D.	Stopping potential
Answer» C. Work function

Discussion

4105.	A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed \[\frac{1}{2}m\] away, the number of electrons emitted by photo cathode would [CBSE PMT 2001; AIEEE 2005]
A.	Decrease by a factor of 2
B.	Increase by a factor of 2
C.	Decrease by a factor of 4
D.	Increase by a factor of 4
Answer» E.

Discussion

4106.	Energy of a quanta of frequency \[{{10}^{15}}\]Hz and \[h=6.6\times {{10}^{-34}}J\text{-}\sec \] will be [RPMT 1997]
A.	\[6.6\times {{10}^{-19}}J\]
B.	\[6.6\times {{10}^{-12}}J\]
C.	\[6.6\times {{10}^{-49}}J\]
D.	\[6.6\times {{10}^{-41}}J\]
Answer» B. \[6.6\times {{10}^{-12}}J\]

Discussion

4107.	A photosensitive metallic surface has work function \[h{{v}_{0}}\]. If photons of energy \[2h{{v}_{0}}\] fall on this surface the electrons come out with a maximum velocity of \[4\times {{10}^{6}}\,m/s\]. When the photon energy is increases to \[5h{{v}_{0}}\] then maximum velocity of photo electron will be [CBSE PMT 2005]
A.	\[2\times {{10}^{6}}\,m/s\]
B.	\[2\times {{10}^{7}}\,m/s\]
C.	\[8\times {{10}^{5}}\,m/s\]
D.	\[8\times {{10}^{6}}\,m/s\]
Answer» E.

Discussion

4108.	The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein?s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 Å is/are [CBSE PMT 2005]
A.	None of these
B.	A only
C.	A and B only
D.	All the three metals
Answer» D. All the three metals

Discussion

4109.	Which of one is correct [DCE 1998]
A.	\[{{E}^{2}}={{p}^{2}}{{c}^{2}}\]
B.	\[{{E}^{2}}={{p}^{2}}c\]
C.	\[{{E}^{2}}=p{{c}^{2}}\]
D.	\[{{E}^{2}}={{p}^{2}}/{{c}^{2}}\]
Answer» B. \[{{E}^{2}}={{p}^{2}}c\]

Discussion

4110.	The minimum wavelength of photon is 5000 Å, its energy will be [RPMT 2004]
A.	2.5 eV
B.	50 V
C.	5.48 eV
D.	7.48 eV
Answer» B. 50 V

Discussion

4111.	The work function of a metal is [RPMT 2004]
A.	The energy for the electron to enter into the metal
B.	The energy for producing X-ray
C.	The energy for the electron to come out from metal surface
D.	None of these
Answer» D. None of these

Discussion

4112.	If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is [RPMT 2003]
A.	4.58 eV
B.	2.28 eV
C.	1.14 eV
D.	0.23 eV
Answer» C. 1.14 eV

Discussion

4113.	The photoelectric effect can be understood on the basis of [Pb. PET 2004]
A.	The principle of superposition
B.	The electromagnetic theory of light
C.	The special theory of relativity
D.	Line spectrum of the atom
Answer» E.

Discussion

4114.	In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon [DCE 2003]
A.	Intensity of light
B.	Frequency of incident light
C.	Velocity of incident light
D.	Both intensity and velocity of light
Answer» C. Velocity of incident light

Discussion

4115.	Photo-electric effect can be explained by [DCE 2003]
A.	Corpusular theory of light
B.	Wave nature of light
C.	Bohr?s theory
D.	Quantum theory of light
Answer» E.

Discussion

4116.	The ratio of the energy of a photon with \[\lambda =150\,nm\] to that with \[\lambda =300\,nm\] is [DCE 2003]
A.	2
B.	1/4
C.	4
D.	1/2
Answer» B. 1/4

Discussion

4117.	The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be [MP PET 1997]
A.	2.5/5000 eV
B.	\[2.5/{{(5000)}^{2}}eV\]
C.	\[2.5\times 5000\ eV\]
D.	\[2.5\times {{(5000)}^{2}}eV\]
Answer» D. \[2.5\times {{(5000)}^{2}}eV\]

Discussion

4118.	If the energy of the photon is increased by a factor of 4, then its momentum [UPSEAT 2004]
A.	Does not change
B.	Decreases by a factor of 4
C.	Increases by a factor of 4
D.	Decreases by a factor of 2
Answer» D. Decreases by a factor of 2

Discussion

4119.	A photon of energy 8 eV is incident on a metal surface of threshold frequency \[1.6\times {{10}^{15}}\,Hz\], then the maximum kinetic energy of photoelectrons emitted is \[(h=6.6\times {{10}^{-34}}\,Js)\] [Pb. PET 2002]
A.	4.8 eV
B.	2.4 eV
C.	1.4 eV
D.	0.8 eV
Answer» D. 0.8 eV

Discussion

4120.	If the work function of a photometal is 6.825 eV. Its threshold wavelength will be \[(c=3\times {{10}^{8}}\,m/s)\] [Pb. PET 2000; BHU 2004]
A.	1200 Å
B.	1800 Å
C.	2400 Å
D.	3600 Å
Answer» C. 2400 Å

Discussion

4121.	The velocity of photon is proportional to (where n is frequency) [Pb. PMT 2004]
A.	\[\frac{{{\nu }^{2}}}{2}\]
B.	\[\frac{1}{\sqrt{\nu }}\]
C.	\[\sqrt{\nu }\]
D.	n
Answer» E.

Discussion

4122.	If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be [J & K CET 2004]
A.	25
B.	0.25
C.	\[0.25\times {{10}^{4}}\]
D.	\[25\times {{10}^{4}}\]
Answer» D. \[25\times {{10}^{4}}\]

Discussion

4123.	If the energy of a photon corresponding to a wavelength of 6000 Å is \[3.32\times {{10}^{-19}}J\], the photon energy for a wavelength of 4000 Å will be [DPMT 2004]
A.	1.4 eV
B.	4.9 eV
C.	3.1 eV
D.	1.6 eV
Answer» D. 1.6 eV

Discussion

4124.	Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is [MP PMT 2004]
A.	3.5 eV
B.	13.6 eV
C.	6.8 eV
D.	1.5 eV
Answer» E.

Discussion

4125.	The frequency and work function of an incident photon are n and \[{{\varphi }_{0}}\]. If n0 is the threshold frequency then necessary condition for the emission of photo electron is [RPET 2003]
A.	\[\nu <{{\nu }_{0}}\]
B.	\[\nu =\frac{{{\nu }_{0}}}{2}\]
C.	\[\nu \ge {{\nu }_{0}}\]
D.	None of these
Answer» D. None of these

Discussion

4126.	Consider the two following statements A and B and identify the correct choice given in the answers; In photovlotaic cells the photoelectric current produced is not proportional to the, intensity of incident light. In gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation. [EAMCET (Engg.) 2003]
A.	Both A and B are true
B.	Both A and B are false
C.	A is true but B is false
D.	A is false B is true
Answer» E.

Discussion

4127.	The momentum of a photon in an X-ray beam of \[{{10}^{-10}}\]metre wavelength is [MP PET 1996]
A.	\[1.5\times {{10}^{-23}}kg-\]m/sec
B.	\[6.6\times {{10}^{-24}}kg-m/\sec \] m/sec
C.	\[6.6\times {{10}^{-44}}kg-m/\sec \]m/sec
D.	\[2.2\times {{10}^{-52}}kg-m/\sec \] m/sec
Answer» C. \[6.6\times {{10}^{-44}}kg-m/\sec \]m/sec

Discussion

4128.	Two identical photo-cathodes receive light of frequencies \[{{f}_{1}}\] and \[{{f}_{2}}\]. If the velocities of the photo electrons (of mass \[m\]) coming out are respectively \[{{v}_{1}}\] and \[{{v}_{2}}\], then [AIEEE 2003]
A.	\[{{v}_{1}}-{{v}_{2}}={{\left[ \frac{2h}{m}\left( {{f}_{1}}-{{f}_{2}} \right) \right]}^{1/2}}\]
B.	\[v_{1}^{2}-v_{2}^{2}=\frac{2h}{m}\left( {{f}_{1}}-{{f}_{2}} \right)\]
C.	\[{{v}_{1}}+{{v}_{2}}={{\left[ \frac{2h}{m}\left( {{f}_{1}}+{{f}_{2}} \right) \right]}^{1/2}}\]
D.	\[v_{1}^{2}+v_{2}^{2}=\frac{2h}{m}\left( {{f}_{1}}+{{f}_{2}} \right)\]
Answer» C. \[{{v}_{1}}+{{v}_{2}}={{\left[ \frac{2h}{m}\left( {{f}_{1}}+{{f}_{2}} \right) \right]}^{1/2}}\]

Discussion

4129.	Which of the following shown particle nature of light [AFMC 2003; CBSE PMT 2001]
A.	Refraction
B.	Interference
C.	Polarization
D.	Photoelectric effect
Answer» E.

Discussion

4130.	The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be [BHU 2003]
A.	2900 Å
B.	2500 Å
C.	5380 Å
D.	2000 Å
Answer» D. 2000 Å

Discussion

4131.	By photoelectric effect, Einstein, proved [MP PET 2003]
A.	\[E=hv\]
B.	\[K.E.=\frac{1}{2}m{{v}^{2}}\]
C.	\[E=m{{c}^{2}}\]
D.	\[E=\frac{Rh{{c}^{2}}}{{{n}^{2}}}\]
Answer» B. \[K.E.=\frac{1}{2}m{{v}^{2}}\]

Discussion

4132.	Light of frequency 4n0 is incident on the metal of the threshold frequency n0. The maximum kinetic energy of the emitted photoelectrons is [MP PET 2002]
A.	\[3\,h{{\nu }_{0}}\]
B.	\[2\,h{{\nu }_{0}}\]
C.	\[\frac{3}{2}\,h{{\nu }_{0}}\]
D.	\[\frac{1}{2}h{{\nu }_{0}}\]
Answer» B. \[2\,h{{\nu }_{0}}\]

Discussion

4133.	When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of [CBSE PMT 2002; DCE 1997; AIIMS 2004]
A.	X-rays
B.	Radio wave
C.	Infrared rays
D.	Greenhouse effect
Answer» B. Radio wave

Discussion

4134.	The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately [MP PMT 2002]
A.	2 eV
B.	1 eV
C.	0.1\[eV\]
D.	3 eV
Answer» B. 1 eV

Discussion

4135.	When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If \[e/m\] for the electron is \[1.8\times {{10}^{11}}\,C\,k{{g}^{-1}}\] the maximum velocity of the ejected electrons is [Kerala (Engg.) 2002]
A.	\[6\times {{10}^{5}}\,m{{s}^{-1}}\]
B.	\[8\times {{10}^{5}}\,m{{s}^{-1}}\]
C.	\[1.8\times {{10}^{6}}\,m{{s}^{-1}}\]
D.	\[1.8\times {{10}^{5}}\,m{{s}^{-1}}\]
Answer» D. \[1.8\times {{10}^{5}}\,m{{s}^{-1}}\]

Discussion

4136.	The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = \[6\times {{10}^{-34}}\,J\text{-}sec\]) [Kerala (Engg.) 2002; Pb. PET 2001]
A.	100
B.	1000
C.	\[3\times {{10}^{20}}\]
D.	\[3\times {{10}^{18}}\]
Answer» D. \[3\times {{10}^{18}}\]

Discussion

4137.	A radio transmitter radiates 1 kW power at a wavelength 198.6 metres. How many photons does it emit per second [Kerala (Engg.) 2002]
A.	\[{{10}^{10}}\]
B.	\[{{10}^{20}}\]
C.	\[{{10}^{30}}\]
D.	\[{{10}^{40}}\]
Answer» D. \[{{10}^{40}}\]

Discussion

4138.	A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell [KCET 2002]
A.	Are one quarter as numerous
B.	Are half as numerous
C.	Each carry one quarter of their previous momentum
D.	Each carry one quarter of their previous energy
Answer» B. Are half as numerous

Discussion

4139.	Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are [Orissa (Engg.) 2002; DPMT 2004]
A.	5.5\[V\]
B.	1.5\[V\]
C.	9.5\[V\]
D.	4.0\[V\]
Answer» E.

Discussion

4140.	Sodium and copper have work functions 2.3\[eV\]and 4.5\[eV\] respectively. Then the ratio of their threshold wavelengths is nearest to [AIEEE 2002]
A.	1: 2
B.	4 : 1
C.	2 : 1
D.	1 : 4
Answer» D. 1 : 4

Discussion

4141.	Light of two different frequencies whose photons have energies \[1eV\] and \[2.5eV\] respectively, successively illuminates a metal of work function \[0.5eV\]. The ratio of maximum kinetic energy of the emitted electron will be [AIEEE 2002]
A.	1 : 5
B.	1 : 4
C.	1 : 2
D.	1 : 1
Answer» C. 1 : 2

Discussion

4142.	The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be [JIPMER 2002]
A.	\[4\times {{10}^{10}}Hz\]
B.	\[4\times {{10}^{11}}Hz\]
C.	\[4\times {{10}^{14}}Hz\]
D.	\[4\times {{10}^{-10}}Hz\]
Answer» D. \[4\times {{10}^{-10}}Hz\]

Discussion

4143.	According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum [AMU (Engg.) 2001]
A.	Energy and momentum
B.	Speed and momentum
C.	Speed only
D.	Energy only
Answer» D. Energy only

Discussion

4144.	Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be [MP PET 2001]
A.	0 eV
B.	1 eV
C.	2 eV
D.	10 eV
Answer» B. 1 eV

Discussion

4145.	The photoelectric threshold wavelength for potassium (work function being \[2eV\]) is [CPMT 2001]
A.	310 nm
B.	620 nm
C.	1200 nm
D.	2100 nm
Answer» C. 1200 nm

Discussion

4146.	Light of frequency \[8\times {{10}^{15}}Hz\] is incident on a substance of photoelectric work function \[6.125\,eV.\] The maximum kinetic energy of the emitted photoelectrons is [AFMC 2001]
A.	17\[eV\]
B.	22\[eV\]
C.	27\[eV\]
D.	37\[eV\]
Answer» D. 37\[eV\]

Discussion

4147.	If intensity of incident light is increased in PEE then which of the following is true [RPET 2001]
A.	Maximum K.E. of ejected electron will increase
B.	Work function will remain unchanged
C.	Stopping potential will decrease
D.	Maximum K.E. of ejected electron will decrease
Answer» C. Stopping potential will decrease

Discussion

4148.	The approximate wavelength of a photon of energy 2.48 eV is [MP PMT 1987]
A.	500 Å
B.	5000 Å
C.	2000 Å
D.	1000 Å
Answer» C. 2000 Å

Discussion

4149.	If threshold wavelength for sodium is 6800Å then the work function will be [RPET 2001]
A.	\[1.8eV\]
B.	\[2.5eV\]
C.	\[2.1eV\]
D.	\[1.4eV\]
Answer» B. \[2.5eV\]

Discussion

4150.	Light of frequency n is incident on a certain photoelectric substance with threshold frequency n0. The work function for the substance is [MP PMT 2001]
A.	hn
B.	hn0
C.	\[h(\nu -{{\nu }_{0}})\]
D.	\[h(\nu +{{\nu }_{0}})\]
Answer» C. \[h(\nu -{{\nu }_{0}})\]

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

A photon of energy 8 eV is incident on metal surface of threshold frequency \[1.6\times {{10}^{15}}Hz.\] The maximum kinetic energy of the photoelectrons emitted (in eV) (Take \[h=6\times {{10}^{-34}}Js)\]. [MP. PET 2005]

The incident photon involved in the photoelectric effect experiment. [EAMCET 2005]

The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons [BHU 2005]

The magnitude of saturation photoelectric current depends upon [AFMC 2005]

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed \[\frac{1}{2}m\] away, the number of electrons emitted by photo cathode would [CBSE PMT 2001; AIEEE 2005]

Energy of a quanta of frequency \[{{10}^{15}}\]Hz and \[h=6.6\times {{10}^{-34}}J\text{-}\sec \] will be [RPMT 1997]

The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein?s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 Å is/are [CBSE PMT 2005]

Which of one is correct [DCE 1998]

The minimum wavelength of photon is 5000 Å, its energy will be [RPMT 2004]

The work function of a metal is [RPMT 2004]

If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is [RPMT 2003]

The photoelectric effect can be understood on the basis of [Pb. PET 2004]

In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon [DCE 2003]

Photo-electric effect can be explained by [DCE 2003]

The ratio of the energy of a photon with \[\lambda =150\,nm\] to that with \[\lambda =300\,nm\] is [DCE 2003]

The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be [MP PET 1997]

If the energy of the photon is increased by a factor of 4, then its momentum [UPSEAT 2004]

A photon of energy 8 eV is incident on a metal surface of threshold frequency \[1.6\times {{10}^{15}}\,Hz\], then the maximum kinetic energy of photoelectrons emitted is \[(h=6.6\times {{10}^{-34}}\,Js)\] [Pb. PET 2002]

If the work function of a photometal is 6.825 eV. Its threshold wavelength will be \[(c=3\times {{10}^{8}}\,m/s)\] [Pb. PET 2000; BHU 2004]

The velocity of photon is proportional to (where n is frequency) [Pb. PMT 2004]

If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be [J & K CET 2004]

If the energy of a photon corresponding to a wavelength of 6000 Å is \[3.32\times {{10}^{-19}}J\], the photon energy for a wavelength of 4000 Å will be [DPMT 2004]

Light of wavelength 1824 Å, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 Å is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is [MP PMT 2004]

The frequency and work function of an incident photon are n and \[{{\varphi }_{0}}\]. If n­0 is the threshold frequency then necessary condition for the emission of photo electron is [RPET 2003]

The momentum of a photon in an X-ray beam of \[{{10}^{-10}}\]metre wavelength is [MP PET 1996]

Two identical photo-cathodes receive light of frequencies \[{{f}_{1}}\] and \[{{f}_{2}}\]. If the velocities of the photo electrons (of mass \[m\]) coming out are respectively \[{{v}_{1}}\] and \[{{v}_{2}}\], then [AIEEE 2003]

Which of the following shown particle nature of light [AFMC 2003; CBSE PMT 2001]

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be [BHU 2003]

By photoelectric effect, Einstein, proved [MP PET 2003]

Light of frequency 4n0 is incident on the metal of the threshold frequency n0. The maximum kinetic energy of the emitted photoelectrons is [MP PET 2002]

When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of [CBSE PMT 2002; DCE 1997; AIIMS 2004]

The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately [MP PMT 2002]

When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If \[e/m\] for the electron is \[1.8\times {{10}^{11}}\,C\,k{{g}^{-1}}\] the maximum velocity of the ejected electrons is [Kerala (Engg.) 2002]

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = \[6\times {{10}^{-34}}\,J\text{-}sec\]) [Kerala (Engg.) 2002; Pb. PET 2001]

A radio transmitter radiates 1 kW power at a wavelength 198.6 metres. How many photons does it emit per second [Kerala (Engg.) 2002]

A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell [KCET 2002]

Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are [Orissa (Engg.) 2002; DPMT 2004]

Sodium and copper have work functions 2.3\[eV\]and 4.5\[eV\] respectively. Then the ratio of their threshold wavelengths is nearest to [AIEEE 2002]

Light of two different frequencies whose photons have energies \[1eV\] and \[2.5eV\] respectively, successively illuminates a metal of work function \[0.5eV\]. The ratio of maximum kinetic energy of the emitted electron will be [AIEEE 2002]

The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be [JIPMER 2002]

According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum [AMU (Engg.) 2001]

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be [MP PET 2001]

The photoelectric threshold wavelength for potassium (work function being \[2eV\]) is [CPMT 2001]

Light of frequency \[8\times {{10}^{15}}Hz\] is incident on a substance of photoelectric work function \[6.125\,eV.\] The maximum kinetic energy of the emitted photoelectrons is [AFMC 2001]

If intensity of incident light is increased in PEE then which of the following is true [RPET 2001]

The approximate wavelength of a photon of energy 2.48 eV is [MP PMT 1987]

If threshold wavelength for sodium is 6800Å then the work function will be [RPET 2001]

Light of frequency n is incident on a certain photoelectric substance with threshold frequency n0. The work function for the substance is [MP PMT 2001]

The frequency and work function of an incident photon are n and \[{{\varphi }_{0}}\]. If n0 is the threshold frequency then necessary condition for the emission of photo electron is [RPET 2003]