Q. 49

Expert-verifiedFound in: Page 1209

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

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

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

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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