A sodium lamp emits 3.14×1020 photons per second. The distance from the sodium lamp where flux of photon is one photon per second per cm2 :–
(a) 5×109 cm
(b) 5×108 cm
(c) 0.5×109 cm
(d) Zero
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A sodium lamp emits 3.14×1020 photons per second. The distance from the sodium lamp where flux of photon is one photon per second per cm2 :–
(a) 5×109 cm
(b) 5×108 cm
(c) 0.5×109 cm
(d) Zero
A sodium lamp emits 3.14×1020 photons per second. The distance from the sodium lamp where flux of photon is one photon per second per cm2 :–
(a) 5×109 cm
(b) 5×108 cm
(c) 0.5×109 cm
(d) Zero
Correct Option (a) 5×109 cm
Explanation:
Photon flux at a distance d = no. of photons emitted per second/4πd2
= 3.14 x 1020/4 x 3.14 x d2
d = 5 x 109 cm