Potential difference required in an electron microscope to give an electron wavelength of 4. 5 nm will be 0.063 V.
The difference in potential between two points that represents the work involved or the energy released in the transfer of a unit quantity of electricity from one point to the other is called potential difference.
The wavelength of an electron is calculated for a given energy (accelerating voltage) by using the de Broglie relation between the momentum p and the wavelength λ of an electron
lambda = 4.5 nm = 4.5 * 
m
h = 
J s
e = 1.6 * 
C
m = 9.1 * 
kg
Energy = eV
lambda = h / 
= h / 
= 
/ (2m (eV))
V = / (2 m e )
V = 
/ 2 * 9.1 * * 1.6 * * 
V = 0.063 V
To learn more about wavelength of an electron here
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Answer:
2.75 N
Explanation:
Given that,
Box A has a mass 21.0 kg and box B has a mass 8.0 kg.
A horizontal force of 100N is exerted on box A.
Let a be the acceleration of the system. Using second law of motion,
Now applying Newton's second law to box B. So,
So, 2.75 N is the force that box A exerts on box B.
Longer the air column is the more harmonics are created. due to the longer column the waves have more space to bounce off of the sides of the column to create more harmonics.
Answer:
weight. The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull.
Explanation:
This may be right i'm not 100%
