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Asked Feb 18, 2020
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Davisson and Germer scattered electrons from a crystal of nickel. The scattered electrons formed a strong diffraction pattern. What important conclusion was drawn from this experiment?

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Expert Answer

Step 1

The Davisson and Germer experiment states that the phase difference of the waves, that are reflected from two different atomic layers of a crystal of the nickel, is fixed. These waves interfere either constructively or destructively after reflection. This results in producing a diffraction pattern.

 

In this experiment, the waves are used in place of electrons that form a diffraction pattern. Thus, it verifies the dual nature of matter. It can be related to the de Broglie equation and Bragg’s law.

 

Write the de Broglie equation.

Physics homework question answer, step 1, image 1

Step 2

From the above expression, the wavelength of the wave can be calculated if the voltage is known.

 

Write the Bragg’s law equation.

Physics homework question answer, step 2, image 1

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