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Q. No.The inverse square law of intensity (i.e., the intensity \(\propto \frac{1}{r^2})\) is valid for:
1. a point source
2. a line source
3. a plane source
4. a cylindrical source
1. a point source
2. a line source
3. a plane source
4. a cylindrical source
Subtopic: Huygens' Principle |
86%
Level 1: 80%+
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If Young's double-slit experiment is performed in water,
1. the fringe width will decrease
2. the fringe width will increase
3. the fringe width will remain unchanged
4. there will be no fringe
Subtopic: Young's Double Slit Experiment |
81%
Level 1: 80%+
Hints
A light wave can travel:
| (a) | in vacuum |
| (b) | in vacuum only |
| (c) | in a material medium |
| (d) | in a material medium only |
Choose the correct option from the options given below:
| 1. | (a) and (b) only |
| 2. | (b) and (c) only |
| 3. | (a) and (c) only |
| 4. | (c) and (d) only |
Subtopic: Huygens' Principle |
89%
Level 1: 80%+
Hints
When light is refracted, which of the following does not change?
1. wavelength
2. frequency
3. velocity
4. amplitude
Subtopic: Huygens' Principle |
91%
Level 1: 80%+
Hints
In Young's double-slit experiment conducted with the light of an unknown wavelength, it is found that the fringe width is twice the separation between the slits, \(d,\) which is \(0.5~\text{mm}.\) The slit to screen distance is \(1~\text{m}.\) The wavelength of light used is:
| 1. | \(125~\text{nm}\) | 2. | \(250~\text{nm}\) |
| 3. | \(500~\text{nm}\) | 4. | \(1000~\text{nm}\) |
Subtopic: Young's Double Slit Experiment |
80%
Level 1: 80%+
Hints
What is the angular spread between central maxima and first ordered minima of diffraction pattern due to single slit of width \(0.20\) mm, when light of wavelength \(500\) nm is incident on it normally?
1. \(2\times 10^{-3}\) rad
2. \(2.5\times 10^{-3} \) rad
3. \(3\times 10^{-3}\) rad
4. \(4\times 10^{-3}\) rad
1. \(2\times 10^{-3}\) rad
2. \(2.5\times 10^{-3} \) rad
3. \(3\times 10^{-3}\) rad
4. \(4\times 10^{-3}\) rad
Subtopic: Diffraction |
86%
Level 1: 80%+
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Hints
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In a Young's Double Slit Experiment (YDSE) using white light, the fringe immediately adjacent to the central white fringe on either side appears red. Which colour is observed at the farthest visible fringe from the centre?
1. Red
2. Blue
3. Green
4. Yellow
1. Red
2. Blue
3. Green
4. Yellow
Subtopic: Young's Double Slit Experiment |
74%
Level 2: 60%+
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In Young's double slit experiment, the \(7^\text{th}\) maximum with wavelength \({\mathit{\lambda}}_{1}\) is at a distance \(d_1\) from the center of the screen, and that with wavelength \({\mathit{\lambda}}_{2}\) is at a distance \(d_2\) from the center of the screen. Then (\(d_1/d_2\)) is:
| 1. | \(\left({{\mathit{\lambda}}_{1}/{\mathit{\lambda}}_{2}}\right)\) | 2. | \(\left({{\mathit{\lambda}}_{2}/{\mathit{\lambda}}_{1}}\right)\) |
| 3. | \(\left({{\mathit{\lambda}}_{1}^{2}/{\mathit{\lambda}}_{2}^{2}}\right)\) | 4. | \(\left({{\mathit{\lambda}}_{2}^{2}/{\mathit{\lambda}}_{1}^{2}}\right)\) |
Subtopic: Young's Double Slit Experiment |
77%
Level 2: 60%+
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The first diffraction minimum due to single slit diffraction is at \(\theta ~{=}~30^{\circ}\) for a light of wavelength \(5000~\mathring{A}.\) The width of the slit is:
| 1. | \({5}\times{10}^{{-}{5}}~\text{cm}\) | 2. | \({1}{.}{0}\times{10}^{{-}{4}}~\text{cm}\) |
| 3. | \({2}{.}{5}\times{10}^{{-}{5}}~\text{cm}\) | 4. | \({1}{.}{25}\times{10}^{{-}{5}}~\text{cm}\) |
Subtopic: Diffraction |
78%
Level 2: 60%+
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Two coherent monochromatic light beams of intensities \(9I\) and \(4I\) are superposed. The maximum possible intensity in the resulting beam is:
| 1. | \(I\) | 2. | \(3I\) |
| 3. | \(16I\) | 4. | \(25I\) |
Subtopic: Interference vs Diffraction |
90%
Level 1: 80%+
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