An x ray tube has an applied voltage of 100 kV.

a. What is the most energetic x-ray photon it can produce? Express your answer in electron volts and joules.
b. Find the wavelength of such an X—ray.

Respuesta :

To solve this problem we will apply the concepts related to Energy in a photon and the electric potential energy. With these two definitions we can solve the first two points. The energy in a photon is described under the mathematical relationship

[tex]E = \frac{hc}{\lambda}[/tex]

Here,

E = Energy of photons

h = Planck's constant

c = Speed of light

[tex]\lambda =[/tex] Wavelength

At the same time the electric potential energy is defined as

E = qV

Where,

q = Charge of electron

V = Voltage

PART A ) The charge of the electron is a constant while the voltage was previously given, therefore

[tex]E = qV[/tex]

[tex]E = (1.6*10^{-19}C)(100*10^3V)[/tex]

[tex]E = 1.6*10^{-14}J (\frac{1eV}{1.6*10^{-19}J})[/tex]

[tex]E = 10^5eV[/tex]

PART B) From the first definition, about energy in a photon, we can use it to find the wavelength. Energy is therefore conserved, the previously found value will serve us for that variable. The other two terms are constant, so replacing

[tex]E = \frac{hc}{\lambda}[/tex]

[tex]1.6*10^{-14}J =\frac{(1.6*10^{-14}J)(3*10^8m/s)}{\lambda}[/tex]

[tex]\lambda = 1.24*10^{-11}m[/tex]

Therefore the wavelength of the X-ray is [tex]\lambda = 1.24*10^{-11}m[/tex]

The energy of the photon is 1.6 * 10^5 ev or 1.6 * 10^-14 J while the wavelength of the waves is 1.23 * 10^-13 m.

What is x - ray?

The x - ray is part of the group of the electromagnetic rays which is collectively called the electromagnetic spectrum. We have the applied voltage as 100 kV.

Hence;

E = qv = 1.6 * 10^-19 * 100 * 10^3 V =  1.6 * 10^5 ev or 1.6 * 10^-14 J

Hence, the most energetic x-ray photon it can produce is  1.6 * 10^5 ev or 1.6 * 10^-14 J.

Given that;

E = hc/λ

λ = E/hc

λ = 6.6 * 10^-34 * 3 * 10^8/1.6 * 10^-14 J

λ =1.23 * 10^-13 m

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