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The number of photons emitted in 10 hour...

The number of photons emitted in 10 hours by 60 W sodium lamp (`lambda= 5893 Å`) is about :

A

`6.4 xx 10^20`

B

`6.4 xx 10^24`

C

`3.2 xx 10^24`

D

`1.4 xx 10^22`

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The correct Answer is:
B
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