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Q. 49

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1209

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Short Answer

A ruby laser emits a , -long pulse of light with a wavelength of . How many chromium atoms undergo stimulated emission to generate this pulse?

The number of chromium atoms undergo stimulated emission to generate this pulse are

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Step by Step Solution

Step 1 : Given information

We are given that power of ruby laser is ,wavelength is , time .

We need to find that how many chromium atoms undergo stimulated emission to generate this pulse

Step 2 : Simplify

To calculate number of photons , we will use equation , where is number of photons and is energy of photons . For that matter we need to calculate ,;

We will use formula of power ,

Substituting the values we get,

We will also use

Substituting the values we get,

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