**A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x * 10²⁰. The value of x is________.

[Given: h = 6.63 * 10^-34 Js and c = 3.0 * 10⁸ ms^-1]**

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Alok Kumar Singh | Contributor-Level 10

6 months ago

Power = 50 watt = 50 J/sec

Energy emitted per second = 50 J

Wavelength ; $λ$ = 795 nm

Energy of one photon =

$= 0.025 * 1 0^{- 17} J$

Number of photons emitted per second = $\frac{50}{0.025 * 1 0^{- 17}}$

= 2 * 10²⁰

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A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x * 1020. The value of x is________. [Given: h = 6.63 * 10-34 Js and c = 3.0 * 108 ms-1]

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