As waves get closer to the beach they increase in energy
Explanation:
Given that,
The mean kinetic energy of the emitted electron, 
(a) The relation between the kinetic energy and the De Broglie wavelength is given by :



(b) According to Bragg's law,

n = 1
For nickel, 



As the angle made is very small, so such an electron is not useful in a Davisson-Germer type scattering experiment.
Answer:
.2166 repeating or 21.66% repeating
Explanation:
In attached image
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Answer:
Hope the above picture might help you :)