Necessary condition for photo-electric emission is:

1.	Necessary condition for photo-electric emission is:
A.	hν ≥ eϕ
B.	hν ≥ mc
C.	hν ≥ eϕ2
D.	\(hν ≥ \frac{1}{2}mc\)
Answer» B. hν ≥ mc

Discussion

No Comment Found

Related MCQs

An acceptable wave function Ψ associated with a moving particle must be:
Calculate the wavelength (in nm) of the spectral line of Balmer series for n = 3. (Rydberg constant = 1.1 × 107 m-1)
A stationary source emits sound waves of frequency 500 Hz. Two observers moving along a line passing through the source detect sound to be of frequencies 480 Hz and 530 Hz. Their respective speeds are, in ms-1,(Given speed of sound = 300 m/s)
A nucleus A, with a finite de-Broglie wavelength λA, undergoes spontaneous fission into two nuclei B and C of equal mass. B flies in the same direction as that of A, while C files in the opposite direction with a velocity equal to half of that of B. The de-Broglie wavelengths λB and λC of B and C are respectively:
Electron emission from a metallic surface by application of light is known as
A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one fourth of its original value, then the maximum kinetic energy of the emitted photoelectrons would become
An excited He+ ion emits two photons in succession, with wavelengths 108.5 nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength λ, energy \({\rm{E}} = \frac{{1240\;{\rm{eV}}}}{{\lambda \left( {{\rm{in\;nm}}} \right)}}\))
A photocathode has a work function of 2.4 eV. It is illuminated with monochromatic radiation whose photon energy is 3.9 eV The maximum kinetic energy of the photoelectrons produced is:
In the Bohr model of the hydrogen atom, let R, V and E represent the radius of the orbit, the speed of the electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n?
According to Bohr model, the radius of the electron orbit in the n = 1 level of the hydrogen atom is 0.053 nm. The radius for the n = 3 level is:

Necessary condition for photo-electric emission is:

Discussion

No Comment Found

Related MCQs

Reply to Comment