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A bulb of 1 watt power on working for 1 ...

A bulb of 1 watt power on working for 1 second emitted `2.0xx10^(16)` photons. The wavelength photons is nearly : `(h = 6.62xx10^(-34)Js, c=3xx10^(8)ms^(-1))`

A

`2 pm`

B

`4 nm`

C

`9 pm`

D

`12 nm`

Text Solution

Verified by Experts

The correct Answer is:
B
A bulbof 1 watt power on working …….
`E_(r ) = (nhc)/(lambda)`
`lambad = (nhc)/(E_(T)) = (2xx10^(16)xx6.62xx10^(-34)xx3xx10^(8))/(1)`
`= 40xx10^(-10)m = 4nm`
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