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The number of photons emitted in 10 hour...

The number of photons emitted in 10 hours by a 60 W sodium lamp `(lambda` of photon `= 6000 Å)`

A

`6.50xx10^(24`

B

`6.40xx10^(23)`

C

`8.40xx10^(23)`

D

`3.40xx10^(23)`

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