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How many photons are emitted per second ...

How many photons are emitted per second by a 5 m W laser source operating at 632.8nm?

A

`1.6xx10^(16)`

B

`1.6xx10^(13)`

C

`1.6xx10^(10)`

D

`1.6xx10^(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`E=(hc)/(lamda)=(6.6xx10^(-34)xx3xx10^(8))/(632.8xx10^(-9))J`
Number of photons per second `n=(P)/(E)`
`impliesn=(5xx10^(-3))/(3.14xx10^(-19))=1.6xx10^(16)`
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