InterviewSolution
Saved Bookmarks
| 1. |
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) 5x109 cm (b) 5x108 cm(c) 0.5×109 cm (d) Zero |
|
Answer» Correct Option (a) 5x109 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 |
|