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Q. No.Consider the following statements about electromagnetic waves and choose the correct ones:
| S1: | electromagnetic waves having wavelengths 1000 times smaller than light waves are called X-rays. |
| S2: | ultraviolet waves are used in the treatment of swollen joints. |
| S3: | alpha and gamma rays are not electromagnetic waves. |
| S4: | de-Broglie waves are not electromagnetic in nature. |
| S5: | electromagnetic waves exhibit polarization while sound waves do not. |
| 1. | S1, S4, and S5 |
| 2. | S3, S4, and S5 |
| 3. | S1, S3, and S5 |
| 4. | S2, S3 and S4 |
Subtopic: Properties of EM Waves |
67%
From NCERT
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Match List - I with List - II.
Choose the correct answer from the options given below:
| List -I (Electromagnetic waves) | List - II (Wavelength) |
| (a) AM radio waves | (i) \(10^{-10}~\text{m}\) |
| (b) Microwaves | (ii) \(10^{2} ~\text{m}\) |
| (c) Infrared radiation | (iii) \(10^{-2} ~\text{m}\) |
| (d) \(X\)-rays | (iv) \(10^{-4} ~\text{m}\) |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iii) | (ii) | (i) | (iv) |
| 4. | (iii) | (iv) | (ii) | (i) |
Subtopic: Electromagnetic Spectrum |
72%
From NCERT
NEET - 2022
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A charge moving in a circular orbit can produce electromagnetic wave.  |
| Reason (R): | The source of electromagnetic wave should be in accelerated motion. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Generation of EM Waves |
79%
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An EM wave of intensity \(I\) falls on a surface kept in a vacuum and exerts radiation pressure \(P\) on it. Which of the following are true?
| (a) | Radiation pressure is \(\frac{I}{c}\) if the wave is totally absorbed. |
| (b) | Radiation pressure is \(\frac{I}{c}\) if the wave is totally reflected. |
| (c) | Radiation pressure is \(\frac{2I}{c}\) if the wave is totally reflected. |
| (d) | Radiation pressure is in the range \(\frac{I}{c}<P<\frac{2I}{c}\) for real surfaces. |
1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (c, d)
Subtopic: Properties of EM Waves |
74%
From NCERT
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The region on the left of the \(y\)-axis \((x<0)\) represents vacuum, and the region on the right \((x>0)\) represents a transparent medium. An electromagnetic wave travelling along the \(x\)-axis given by: \(\vec E_1(x,t)=E_1\hat j~sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is: \(\vec E_2(x,t)=E_2\hat j~sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
1. \(2\)
2. \(\sqrt2\)
3. \(4\)
4. \(2\sqrt2\)
is incident on to the medium on the right. The transmitted wave in the medium is: \(\vec E_2(x,t)=E_2\hat j~sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
1. \(2\)
2. \(\sqrt2\)
3. \(4\)
4. \(2\sqrt2\)
Subtopic: Properties of EM Waves |
62%
From NCERT
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Which of the following situation(s), can cause the radiation of an electromagnetic wave?
| (A) | a varying sinusoidal current flowing through a capacitor |
| (B) | an electric dipole, whose size (and magnitude) is oscillating with time |
| (C) | a steady current flowing through a toroid |
| 1. | only (A) |
| 2. | only (B) |
| 3. | only (A) & (B) |
| 4. | (A), (B), (C) |
Subtopic: Generation of EM Waves |
65%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | The fastest speed of propagation of any wave in any medium is the speed of electromagnetic waves in that medium. |
| Reason (R): | All signals can at most travel at the speed of light in a vacuum. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | (A) is true but (R) is false. |
| 2. | (A) is false but (R) is true. |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
Subtopic: Properties of EM Waves |
From NCERT
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Given below are two statements:
| Statement I: | Electromagnetic waves are radiated when a charged particle undergoes SHM. |
| Statement II: | Electromagnetic waves propagate energy in the direction of the electric field of the wave. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Generation of EM Waves |
57%
From NCERT
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Given below are two statements:
| Statement I: | Electromagnetic waves propagate through all media with a speed \(c=\frac{1}{\sqrt{\varepsilon_0\mu_0}}.\) |
| Statement II: | Electromagnetic waves can undergo reflection and refraction. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Properties of EM Waves |
From NCERT
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The electric field of an electromagnetic wave in free space is given by –
, where t and x are in seconds and metres respectively. It can be inferred that:
(a) The wavelength λ is 188.4 m
(b) The wave number k is 0.33 rad / m
(c) The wave amplitude is 10 V / m
(d) The wave is propagating along + x direction
Which one of the following pairs of statements is correct?
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)
Subtopic: Properties of EM Waves |
From NCERT
AIPMT - 2010
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