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A bulb emits light of wavelength 4500 Å...

A bulb emits light of wavelength `4500` Å .The bulb is rated as `150` W and `8%` of the energy is emmitted as light. How many photons are emitted by the bulb per second?

Text Solution

Verified by Experts

Energy emitted per sec by the bulb `=150xx8/100J`
Energy of one photon `=(hc)/(lamda)`
`=(6.626xx10^(-34)xx3xx10^(8))/(4500xx10^(-10))=4.42xx10^(-19)` Joule
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