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Q. 23

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1207

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Short Answer

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

See the step by step solution

Step by Step Solution

Step 1 : Given information

We have given that,

We have to find the no, of photons emitted per second.

Step 2 : Simplification

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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