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

Options

A. `3xx10^(19)`
B. `3xx10^(24)`
C. `3xx10^(20)`
D. `3xx10^(18)`

Answer

A

Explanation

(a) : Number of photons emitted per second
`=(8%"of P")/(E)=(8Plamda)/(100hc)=(8xx150xx4500xx10^(-10))/(100xx6.63xx10^(-34)xx3xx10^(8))`
`=3xx10^(19)` photons per second