JEE Main2019Physics
Q.
A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is: [Given Planck’s constant h = 6.6 × 10–34 Js, speed of light c = 3.0 × 108 m/s
- A
2 × 1016
- B
1.5 × 1016
- C
1 × 1016
- D
5 × 1015
Solution
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