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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

A

`4.5xx10^(19)`

B

`5.4xx10^(19)`

C

`1.5xx10^(19)`

D

`2.7xx10^(19)`

Text Solution

Verified by Experts

The correct Answer is:
D
A bulb emits light of `lambda = 4500 Å` ………….
`implies (150xx1xx8)/(100) = (12400)/(4500)xx1.6xx10^(-19)xx x`
`implies (12xx4500)/(12400xx1.6)xx10^(19) = x` , `implies x = 2.72xx10^(19)`
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