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A 100 wart bulb emits monochromatic ...

A 100 wart bulb emits monochromatic light of wavelength 400 bn, Calculate the number of photons emitted per second by the bulb.

Text Solution

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Power of the bulb - 100 walt = 10 `js^(-1)`
Energy of one photon E
`hv = (hc )/(lambda) = (6.626xx 10^(34) Js xx 3.0 xx 10^(8) ms^(-1))/( 400 xx 10^(9) m)`
No of photon 4.9695 `xx 10^(19)` energyfrom 1 photon
100 J s energy from how many photon
Number of photons emited
`=(1xx 100 Js^(-1))/(4.9695 xx 10^(19) J) = 2.0123 xx 10^(20) s^(-1)`
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