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X-rays Physics - X-rays

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 56 questions in this chapter.

Question types

X-rays question types

56 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

56
Questions
6
Question groups
5
Question types
Sample Questions

X-rays questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
The X-ray beam emerging from an X-ray tube:
  • A
    Is monochromatic.
  • B
    Has all wavelengths smaller than a certain maximum wavelength.
  • ✓
    Has all wavelengths greater than a certain minimum wavelength.
  • D
    Has all wavelengths lying between a minimum and a maximum wavelength.

Answer: C.

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Q 2M.C.Q (1 Marks)1 Mark
50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be:
  • A
    zero
  • B
    < 0.1mm
  • C
    0.1mm
  • ✓
    > 0.1mm

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark
Visible light passing through a circular hole forms a diffraction disc of radius 0.1mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be:
  • A
    zero
  • ✓
    < 0.1mm
  • C
    0.1mm
  • D
    > 0.1m

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
  • ✓
    25pm
  • B
    50pm
  • C
    75pm
  • D
    100pm

Answer: A.

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Q 5M.C.Q (1 Marks)1 Mark
Cutoff wavelength of $X-$rays coming from a Coolidge tube depends on the:
  • A
    Target material.
  • ✓
    Acelerating voltage.
  • C
    Separation between the target and the filament.
  • D
    Temperature of the filament.

Answer: B.

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Q 102 Marks Questions2 Marks
When 40kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of $9.7 \times 10^{18}Hz$. Calculate the value of Planck constant from these data.
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Q 112 Marks Questions2 Marks
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows.
Cell containing vacancy
K
L
M
Energy in keV
69.5
11.3
2.3
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Q 122 Marks Questions2 Marks
Heat at the rate of 200W is produced in an X-ray tube operating at 20kV. Find the current in the circuit. Assume that only a small fraction of the kinetic energy of electrons is converted into X-rays.
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Q 143 Marks Question3 Marks
A free atom of iron emits $\text{K}_\alpha$ X-rays of energy 6.4keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = $9.3 \times 10^{-26}kg$.
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Q 153 Marks Question3 Marks
The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength $\Big(\frac{1}{\lambda}\Big)$ of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength$\Big(\frac{1}{\lambda}\Big)$ of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.
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Q 163 Marks Question3 Marks
Suppose a monochromatic X-ray beam of wavelength 100pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1mm?
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Q 195 Marks Questions5 Marks
The $\text{K}_\alpha$ and $\text{K}_\beta$ X-rays of molybdenum have wavelengths 0.71A and 0.63A respectively. Find the wavelength of $\text{L}_\alpha$ X-ray of molybdenum.
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Q 205 Marks Questions5 Marks
Use Moseley's law with $b=1$ to find the frequency of the $\mathrm{K}_\alpha \mathrm{X}$-ray of $\mathrm{La}(\mathrm{Z}=57)$ if the frequency of the $\mathrm{K}_\alpha \mathrm{X}$-ray of $\mathrm{Cu}(\mathrm{Z}=29)$ is known to be $1.88 \times 10^{18} \mathrm{~Hz}$.
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Q 215 Marks Questions5 Marks
Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are analysed and the intensity is plotted against the wavelength. Assuming that only $\text{K}_\alpha$ intensities are detected, list the elements present in the sample from the plot. Use Moseley's equation $v - (25 \times 10^{14}Hz)(Z - 1)^2.$
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Q 225 Marks Questions5 Marks
The wavelengths of $\text{K}_\alpha$ and $\text{L}_\alpha$ X-rays of a material are 21.3pm and 141pm respectively. Find the wavelength of $\text{K}_\beta$ X-ray of the material.
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