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Q. No.The velocity of electromagnetic waves in a material medium is \(\dfrac{c}{\sqrt{2}}~\left(c=3 \times 10^8 ~\text{m/s} \right)\). Its permeability is nearly equal to the free space permeability, \(\mu_0\). Its permittivity \(\varepsilon\) is:
(\(\varepsilon_0\) is free space permittivity)
1.
\(\sqrt 2 \varepsilon_0\)
2.
\(2\varepsilon_0\)
3.
\(1.5\varepsilon_0\)
4.
\(3\varepsilon_0\)
Subtopic: Properties of EM Waves |
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Level 2: 60%+
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Which of the following statement is not correct?
| 1. | Electromagnetic waves can be diffracted, refracted and polarised. |
| 2. | Electromagnetic waves carry both energy and momentum. |
| 3. | Electromagnetic waves exert radiation pressure. |
| 4. | Material medium is required for the propagation of electromagnetic waves. |
Subtopic: Properties of EM Waves |
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Level 1: 80%+
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If the total energy of electromagnetic waves falling on a surface is \(E,\) for total absorption, the momentum delivered will be: (where \(c\) is the speed of light)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
1. \(E/c\)
2. \(2E/c\)
3. \(4E/c\)
4. \(E/2c\)
Subtopic: Properties of EM Waves |
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Level 2: 60%+
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Light wave is travelling along the \(y\text-\)axis. The electric field vector \(\vec{E}\) is along the \(x\text-\)axis. The corresponding direction of magnetic field vector \(\vec{B}\) will be along the:
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
1. \(y\text-\)axis
2. \(-x\text-\)axis
3. \(+z\text-\)axis
4. \(-z\text-\)axis
Subtopic: Properties of EM Waves |
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During the propagation of the electromagnetic wave in a medium:
| 1. | electric energy density is double the magnetic energy density. |
| 2. | electric energy density is half the magnetic energy density. |
| 3. | electric energy density is equal to magnetic energy density. |
| 4. | the electric energy density & magnetic energy density are not related to each other. |
Subtopic: Properties of EM Waves |
87%
Level 1: 80%+
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Match List–I with List–II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | UV rays | (I) | Diagnostic tool is medicine |
| (B) | X-rays | (II) | Water purification |
| (C) | Microwave | (III) | Communication, Radar |
| (D) | Infrared wave | (IV) | Improving visibility on foggy days |
Choose the correct answer from the options given below:
| 1. | A-III, B-II, C-I, D-IV |
| 2. | A-II, B-I, C-III, D-IV |
| 3. | A-II, B-IV, C-IIII, D-I |
| 4. | A-III, B-I, C-II, D-IV |
Subtopic: Electromagnetic Spectrum |
85%
Level 1: 80%+
JEE
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A displacement current of \(4.425~\mu\text A\) is developed in the space between the plates of a parallel plate capacitor when voltage is changing at a rate of \(10^{6}~\text{V/s}.\) The area of each plate of the capacitor is \(40~\text{cm}^2.\) The distance between each plate of the capacitor is \(x \times 10^{-3}~\text m.\) The value of \(x\) is:
(the permittivity of free space, \(\epsilon_0=8.85\times10^{-12}~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) )
1. \(2\)
2. \(4\)
3. \(6\)
4. \(8\)
(the permittivity of free space, \(\epsilon_0=8.85\times10^{-12}~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\) )
1. \(2\)
2. \(4\)
3. \(6\)
4. \(8\)
Subtopic: Displacement Current |
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Level 2: 60%+
JEE
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The speed of electromagnetic waves is:
| 1. | higher in vacuum compared to other media. |
| 2. | lower in vacuum compared to other media. |
| 3. | independent of the medium. |
| 4. | lower in some media than in vacuum, and higher in others. |
Subtopic: Properties of EM Waves |
68%
Level 2: 60%+
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\(\alpha\)- particles, \(\beta\)-particles and \(\gamma\)-rays are all having the same energy. Their penetrating power in a given medium in increasing order will be:
1. \(\gamma , \alpha, \beta \)
2. \( \alpha, \beta , \gamma \)
3. \( \beta, \alpha , \gamma \)
4. \(\beta, \gamma, \alpha \)
1. \(\gamma , \alpha, \beta \)
2. \( \alpha, \beta , \gamma \)
3. \( \beta, \alpha , \gamma \)
4. \(\beta, \gamma, \alpha \)
Subtopic: Properties of EM Waves |
74%
Level 2: 60%+
NEET - 2013
Hints
An electromagnetic wave of frequency \(\nu=3.0\) MHz passes from a vacuum into a dielectric medium with relative permittivity \(\varepsilon =4.0.\) Then:
| 1. | wavelength is doubled and frequency becomes half |
| 2. | wavelength is halved and frequency remains unchanged |
| 3. | wavelength and frequency both remain unchanged |
| 4. | wavelength is doubled and frequency unchanged |
Subtopic: Properties of EM Waves |
73%
Level 2: 60%+
NEET - 2013
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