Answer:


is the photon energy of an x-ray
Explanation:
Given:
Energy of photon, 
Then according to given:


is the wavelength
Again,
Energy of photon, 
wavelength of the light, 


<u>Now, photon energy for an x-ray:</u>
wavelength, 

is the photon energy of an x-ray
An
Explanation:
If you push Force is just a fancy word for pushing or pulling.
Answer:
The torque on the board = 11.8 Nm in the anti-clockwise direction
Explanation:
Please find attached the explanation to the answer given.
Answer:
Both are attractive as well as repulsive.
Explanation:
(Like poles repel, like charges<em> repel</em>; unlike poles attract, unlike charges <em>attract</em>).
Compound machines have two or more simple machines