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Calculate the number of photons emitted ...

Calculate the number of photons emitted in `10` hours by a `60 W` sodium lamp (`lambda` of photon `= 5893 Å)`

A

`6.40xx10^(24)`

B

`12.80xx10^(24)`

C

`19.20xx10^(24)`

D

`25.60xx10^(24)`

Text Solution

Verified by Experts

The correct Answer is:
A
The energy of photon `=(hc)/(lamda)=(6.625xx10^(-34)xx3xx10^(8))/(5893xx10^(-10))J`
`=3.37xx10^(-19)J`
Total energy emitted by sodium lamp `=` Watt `xxt`
`=60xx1=60` Joule per sec.
`3.37xx10^(-19)` eneryg =1 photon
`:.` 60 J energy `=60/(3.37xx10^(-9))` Photon per second
`=10xx3600=60/(3.37xx10^(-19))`
`=6.40xx10^(24)`
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