1.

A blube emits light of `lambda = 4500 Å`. The bulb is rated as 150 watt and `8%` of the energy is emitted as light. Number of photons emitted by bulb per second is : `["Take" hc = 12400 eVÅ]`A. `4.5xx10^(19)`B. `5.4xx10^(19)`C. `1.5xx10^(19)`D. `2.7xx10^(19)`

Answer» Correct Answer - 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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