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Q. No.Two coherent sources of light interfere and produce fringe patterns on a screen. For the central maximum, the phase difference between the two waves will be:
1. zero
2. \(\pi\)
3. \(\dfrac{3\pi}{2}\)
4. \(\dfrac{\pi}{2}\)
1. zero
2. \(\pi\)
3. \(\dfrac{3\pi}{2}\)
4. \(\dfrac{\pi}{2}\)
Subtopic: Superposition Principle |
74%
Level 2: 60%+
NEET - 2020
Hints
For a crystal with \(\lambda = 1~\mathring{A}\) and Bragg's angle \(\theta= 60^{\circ}\), the second-order diffraction, \(d\) (distance between two consecutive atomic layers) will be:
1. \(1.15~\mathring{A}\)
2. \(0.75~\mathring{A}\)
3. \(0.55~\mathring{A}\)
4. \(2.1~\mathring{A}\)
1. \(1.15~\mathring{A}\)
2. \(0.75~\mathring{A}\)
3. \(0.55~\mathring{A}\)
4. \(2.1~\mathring{A}\)
Subtopic: Diffraction |
53%
Level 3: 35%-60%
AIPMT - 1998
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The interplanar distance in a crystal is \(2.8 \times 10^{-8}~\text{m}\). The value of the maximum wavelength which can be diffracted:
1. \(2.8 \times 10^{-8}~\text{m}\)
2. \(5.6 \times 10^{-8}~\text{m}\)
3. \(1.4 \times 10^{-8}~\text{m}\)
4. \(7.6 \times 10^{-8}~\text{m} \)
1. \(2.8 \times 10^{-8}~\text{m}\)
2. \(5.6 \times 10^{-8}~\text{m}\)
3. \(1.4 \times 10^{-8}~\text{m}\)
4. \(7.6 \times 10^{-8}~\text{m} \)
Subtopic: Diffraction |
50%
Level 3: 35%-60%
AIPMT - 2001
Hints
The Brewster's angle for an interface should be:
1. \(30^{\circ}<i_b<45^{\circ}\)
2. \(45^{\circ}<i_b<90^{\circ}\)
3. \(i_b=90^{\circ}\)
4. \(0^{\circ}<i_b<30^{\circ}\)
Subtopic: Polarization of Light |
75%
Level 2: 60%+
NEET - 2020
Hints
In Young's double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:
1. half
2. four times
3. one-fourth
4. double
1. half
2. four times
3. one-fourth
4. double
Subtopic: Young's Double Slit Experiment |
83%
Level 1: 80%+
NEET - 2020
Hints
In Young's double-slit experiment, a student observes \(8\) fringes in a certain segment of the screen when a monochromatic light of \(600\) nm wavelength is used. If the wavelength of light is changed to \(400\) nm, then the number of fringes he would observe in the same region of the screen is:
1. \(12\)
2. \(6\)
3. \(8\)
4. \(9\)
1. \(12\)
2. \(6\)
3. \(8\)
4. \(9\)
Subtopic: Young's Double Slit Experiment |
77%
Level 2: 60%+
NEET - 2022
Hints
A linearly polarized monochromatic light of intensity \(10\) lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is \(2.5\) lumen is:
| 1. | \(60^\circ\) | 2. | \(75^\circ\) |
| 3. | \(30^\circ\) | 4. | \(45^\circ\) |
Subtopic: Polarization of Light |
69%
Level 2: 60%+
NEET - 2022
Hints
A monochromatic light of frequency \(500~\text{THz}\) is incident on the slits of Young's double slit experiment. If the distance between the slits is \(0.2~\text{mm}\) and the screen is placed at a distance \(1~\text{m}\) from the slits, the width of \(10\) fringes will be:
| 1. | \(1.5~\text{mm}\) | 2. | \(15~\text{mm}\) |
| 3. | \(30~\text{mm}\) | 4. | \(3~\text{mm}\) |
Subtopic: Young's Double Slit Experiment |
60%
Level 2: 60%+
NEET - 2022
Hints
After passing through a polarizer, a linearly polarized light of intensity \(I\) is incident on an analyser making an angle of \(30^\circ\) with the axes of the polariser. The intensity of light emitted from the analyser will be:
| 1. | \(\dfrac{I}{2}\) | 2. | \(\dfrac{I}{3}\) |
| 3. | \(\dfrac{3I}{4}\) | 4. | \(\dfrac{2I}{3}\) |
Subtopic: Polarization of Light |
83%
Level 1: 80%+
NEET - 2022
Hints
If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
| 1. | angular separation of the fringes increases. |
| 2. | angular separation of the fringes decreases. |
| 3. | linear separation of the fringes increases. |
| 4. | linear separation of the fringes decreases. |
Subtopic: Young's Double Slit Experiment |
68%
Level 2: 60%+
NEET - 2022
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