Answer:
The angle of diffraction are 67.75 deg and 53.57 deg.
Explanation:
Given:
Davisson and Germer experiment with nickel target for electrons bombarding.
Voltages : 
and 
We have to find the angles that is 
and 
.
Concept:
- Davison Germer experiment is based on de Broglie hypothesis where it says matter has both wave and particle nature.
- When electrons get reflected from the surface of a metal target with an atomic spacing of
, they form diffraction patterns. - The positions of diffraction maxima are given by
. - An atomic spacing is
, when the principal maximum corresponds to n=1 - The wavelength is
, and 
.
Solution:
Finding the wavelength at 
.
⇒ 
⇒ 
nm
Plugging the values of wavelength.
⇒ 
⇒ 
⇒ 
degrees.
Now
For for the electrons with energy , 
the wavelength is.
⇒ 
nm
And
⇒ 
degrees.
So,
The angles of diffraction maxima are 67.75 deg and 53.57 deg.
Answer
the medium does not change the speed of the on they should change.
Explanation:
The speed of the waves is constant for a given medium, depending on the physical properties of the medium,
When a wave is strapped on a wall of a medium it does not change the properties of the medium, the wave changes direction, but since the medium does not change the speed of the on they should change.
Explanation:
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The correct answer is visible light, or more precisely the light spectrum. All colors exist because of it and other colors are variations of these colors or mixtures of them.
