Question bank/JEE Main/Physics
JEE MainPhysics
Photons are emitted at the rate of 1.6 × 10^16 per second by a
laser source operating at the wavelength of 632.8 nm. The power of
source is ( in mW )
Show answer and solution
Energy of each photon [IMAGE] = 3.14 ´
10^-19 J
Total energy emitted in one second = 3.14 × 10^-19 × 1.6 × 10^16 = 5
mW
Power = Energy emitted per second = 5 mW
10^-19 J
Total energy emitted in one second = 3.14 × 10^-19 × 1.6 × 10^16 = 5
mW
Power = Energy emitted per second = 5 mW
Source: Grass-G / P-02 Physics Paper-02_Update.docx
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