Answer: 
Explanation:
The Compton Shift 
in wavelength when photons are scattered is given by the following equation:
(1)
Where:
is the wavelength of the scattered photon
is the wavelength of the incident photon
is a constant whose value is given by 
, being 
the Planck constant, 
the mass of the electron and 
the speed of light in vacuum.
the angle between incident phhoton and the scatered photon.
(2)
(3) This is the shift in wavelength
this is a direct current circuit.
Explanation:
Because they change the direction of force and multiply the effort.
They increase the rate of doing work.
So, MA of first class lever can be one or greater than one or less than one
According to the introduction, why are black holes invisible?
the answer is in the first paragraph :)
"Black holes are invisible because they have so much gravity that nothing escapes. Not even light can escape or bounce off."
hope this helped !
We do not feel the gravitational forces from objects other than the Earth because they are weak.
