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Q. 24

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1114

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Short Answer

In the following Figure is an energy-level diagram for a simple atom. What wavelengths, in nm, appear in the atom’s (a) emission spectrum and (b) absorption spectrum?

(a) The emission spectrum wavelengths are

(b) The absorption spectrum wavelengths are

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Step by Step Solution

Part (a) Step 1: Given information

The given wavelength from the transition is

Part (a) Step 2: Finding the wavelengths of emission spectrum 

The solution can begin with a wavelength equation from the transition.

Part (b) Step 1: Given information

The chemical make-up of the gas in the stellar atmosphere determines which wavelengths are absorbed.

Part (b) Step 2: Finding the wavelengths of Absorption spectrum

We only have absorption from and because the atom is in the n=1 state. Because the expressions are the same, the wavelengths are the same.

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