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A blue lamp mainly emits light of wavele...

A blue lamp mainly emits light of wavelength `4500Ã…`. The lamp is rated at 150 W and `8%` of the energy is emitted as visible light. The number of photons number of photons emitted by the lamp per second is

Text Solution

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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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