Tag: option c: imaging

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Questions Related to option c: imaging

Multiple choice detection and recording of x-ray images option c: imaging physics

In Compton scattering process, the incident X-radiation is scattered at an angle $60^o$. The wavelength of the scattered radiation is $0.22 A^o$. The wavelength of the incident X-radiation in $A^o$

  1. 0.508

  2. 0.408

  3. 0.232

  4. 0.208
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

By compton formula
$\Delta \lambda = \lambda _{f} -\lambda _{i}= \dfrac{h}{m _{e}C}(1-cos\theta )$

$0.22\ A^{\circ}-\lambda \ _{i}= 0.024A^{\circ}(1-\dfrac{1}{2}) \ \ \ \ (\because  cos60^{\circ}= 1/2)$

$\lambda   _{i}= 0.22-0.012$
$= 0.208  A^{\circ}$

So, the answer is option (D).

Multiple choice detection and recording of x-ray images option c: imaging physics

If the scattering angle of the photon in Compton effect is $180^{0}$, the Compton shift is

  1. Equal to the Compton wavelength of the electron

  2. four times the Compton wavelength of the electron

  3. two times the Compton wavelength of the electron

  4. half the compton wavelength of the electron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\lambda -\lambda ^{1}  =  \dfrac{h}{m _e c}(1-cos  \theta )$

where
$\lambda $ is initial wavelength
$\lambda^{1} $ is the wavelength after & scattering
$h$ is the plank constant
$m _e$ is the electron rest mass.
$c$ is the speed of light
$\theta $ is the scattering angle.

Multiple choice detection and recording of x-ray images option c: imaging physics

Consider the following statements A and B, identify the correct choice in the given answers. 

A) Tightly bound electrons of target material scatter X-ray photon,resulting in the Compton effect. 
B) Photoelectric effect takes place with free electrons.

  1. Both A and B are true

  2. A is true but B is false

  3. A is false but B is true

  4. Both A and B are false
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Compton effect happens with free electrons.
Photoelectric effect happens to bounded electrons.

Multiple choice detection and recording of x-ray images option c: imaging physics

The value of Compton wavelength of electron is

  1. $0.0243$ $A^{0}$
  2. $0.243$$A^{0}$
  3. $2.43 $$A^{0}$
  4. $24.3 $$A^{0}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The quantity $(\dfrac {h}{m _0c})$ is known as the  Compton wavelength of the electron; it is equal to $2.43\times 10^{-12}$ $m$ or $0.0243 A$. 


Here, $m _0$ is the ,electron rest mass.

Multiple choice detection and recording of x-ray images option c: imaging physics

How would you relate the new frequency to original one when an X-ray photon collides with an electron and bounces off ?

  1. Is lower than its original frequency

  2. Is same as its original frequency

  3. Is higher than its original frequency

  4. Depends upon the electrons frequency
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 From Scattering Formula
$\lambda'-\lambda=\dfrac{G}{M _{e}c}(1-cos \theta )$
We can see, $\lambda '> \lambda $
So $v'< v$

Multiple choice detection and recording of x-ray images option c: imaging physics

Compton effect is associated with

  1. $\alpha -$ rays
  2. $\beta -$rays

  3. Positive rays

  4. X-rays
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Compton scattering is an inelastic scattering of a photon by a quasi-free charged particle, usually an electron. It results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), called the Compton effect. Part of the energy of the photon is transferred to the recoiling electron. Binding energy is equal to work function of metal. In most of metals, the threshold frequency is equal to that of ultravoilet light. So Compton effect is associated with X-rays.

Multiple choice detection and recording of x-ray images option c: imaging physics

Which of the following phenomenon supports the quantum nature of light?

  1. Compton effect

  2. Interference

  3. Diffraction

  4. Polarisation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The wave nature of light is exhibited by interference, diffraction and polarisation of light.
Compton effect is the strongest evidence to show the particle nature of light, and hence the quantum theory of light.

So, the answer is (A).

Multiple choice detection and recording of x-ray images option c: imaging physics

According to photon theory of light which of the following physical quantities  associated with a photon do not / does not change as it collides with an electron is vacuum:

  1. Energy and momentum

  2. Speed and momentum

  3. Speed only

  4. Energy only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Under the photon theory of light, a photon is a discrete bundle (or quantum) of electromagnetic (or light) energy. Photons are always in motion and, in a vacuum, have a constant speed of light to all observers, at the vacuum speed of light (more commonly just called the speed of light) of $c = 2.998 \times 10^8 m/s$

According to the photon theory of light, photons .
move at a constant velocity, $c = 2.9979 \times 10^8 m/s$ (i.e. "the speed of light"), in free space
have zero mass and rest energy.

Carry energy and momentum, which are also related to the frequency $\mu$ and wavelength $\lambda$ of the electromagnetic wave by $E = h \mu$ and $p = \dfrac{h}{\lambda}.$

Can be destroyed/created when radiation is absorbed/emitted.

Can have particle-like interactions (i.e. collisions) with electrons and other particles, such as in the Compton effect