(For example, if you used a lunch meat that claimed to be 97% fat-free, were just 3% of its calories provided by fat?) If the ma
1 answer:
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<h2>Answer: 37.937 keV</h2>
Explanation:
<u>Photons have momentum</u>, this was proved by he American physicist Arthur H. Compton after his experiments related to the <u>scattering of photons from electrons</u> (Compton Effect or Compton Shift). In addition, energy and momentum are conserved in the process.
In this context, the Compton Shift in wavelength when the photons are scattered is given by the following equation:
(1)
Where:
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.
We are told the scattered X-rays (photons) are detected at :
(2)
(3)
Now, the initial energy of the photon is given by:
(4)
From this equation (4) we can find the value of :
(5)
(6)
Knowing the value of and
, let's find
:
Then:
(7)
(8)
Knowing the wavelength of the scattered photon , we can find its energy
:
(9)
(10) This is the energy of the scattered photon
So, if we want to know the energy of the recoiling electron , we have to calculate all the energy lost by the photon, which is:
(11)
Finally we obtain the energy of the recoiling electron:
Ohm's law states that:
Explanation:
Ohm's law states that in a conductor, the potential difference across the conductor is directly proportional to the current flowing through it. Mathematically,
where
V is the potential difference
I is the current
The constant of proportionality is called resistance (R), and it gives a measure of "how much the conductor opposes" to the flow of current. Therefore Ohm's law can be rewritten as
where R is the resistance. By rewriting the equation as
we see that the larger the resistance, the lower the current in the conductor.
Learn more about Ohm's law:
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