A helium-neon laser emits a visible laser beam with a wavelength of . How many photons are emitted per second?
No of photons emitted per second are
We have given that,
We have to find the no, of photons emitted per second.
Since , the laser light emits of light energy per second.
This energy consists of photons. The energy of each photon is
As ,the no. of photons is
So, the photons are emitted at the rate of .
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