Question
Physics Question on Quantum Physics
A 60 W source emits monochromatic light of wavelength 662.5 nm. The number of photons emitted per second is
A
2 × 1020
B
5 × 1026
C
2 × 1029
D
5 × 1017
Answer
2 × 1020
Explanation
Solution
The correct answer is (A) : 2 × 1020.