Answer:
The frequency of the photon decreases upon scattering
Explanation:
Here we note that when a photon is scattered by a charged particle, it is referred to as Compton scattering.
Compton scattering results in a reduction of the energy of the photon and hence an increase in the wavelength (from λ to λ') of the photon known as Compton effect.
Therefore, since the wavelength increases, we have from
λf = λ'f' = c
f = c/λ
Where:
f and f' = The frequency of the motion of the photon before and after the scattering
c = Speed of light (constant)
We have that the frequency, f, is inversely proportional to the wavelength, λ as follows;
f = c/λ
As λ = increases, and c is constant, f decreases, therefore, the frequency of the photon decreases upon scattering.
1) The electrostatic force between the two pieces of paper is
2)
- If the charges of the two pieces of paper are both + or both -, they repel each other
- If the charges of one piece of paper is positive and the other one is negative, they attract each other
Explanation:
1)
The electrostatic force between two charged objects is given by Coulomb's law:
where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
In this problem, we have the following situation:
is the charge on the first piece of paper
is the charge on the second piece of paper
is their separation
Substituting into the equation, we find the magnitude of the electrostatic force between them:
2)
The electrostatic force can be either attractive of repulsive, depending on the relative sign of the charges of the objects involved.
In particular, we have:
- If the two charges have same sign (both positive or both negative), the force between them is repulsive
- If the two charges have opposite sign (one positive and one negative), the force between them is attractive
Therefore, in this case:
- If the charges of the two pieces of paper are both + or both -, they repel each other
- If the charges of one piece of paper is positive and the other one is negative, they attract each other
Learn more about electric force:
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Answer:
Mechanical advantage
Explanation:
Machines help us in giving more output than the input incurred so it only increases mechanical advantage, all the other quantities are dependent on the mechanical advantage.
Answer:
-2R
Explanation:
The focal length can be calculated using this formula
1/f = (n1/n2-1)(1/r1-1/r2)
1/f = (1/1.33-1)(1/r + 1/r)
= -0.133/1.33(2/R)
F = -2R
The focal length is this
Answer:
The correct answer - c. 12.
Explanation:
Given:
Total distance: 6 km
Total time - 45 minutes
covered distance - one half of 6 km = 3 km
time used - 2/3*45 = 30 minutes
Solution:
Remaining distance - 6-3 = 3 km
Remaining time = 45 - 30 = 15 minutes or 1/4 hour
Required speed = remaining distance/ remaining time
=
=
= 12 km/hr