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.
 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 |
71%
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):

 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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Hints

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} 1. (a, b, c) 2. (b, c, d) 3. (a, c, d) 4. (c, d) Subtopic: Properties of EM Waves | 73% From NCERT To view explanation, please take trial in the course. NEET 2023 - Target Batch - Aryan Raj Singh Hints To view explanation, please take trial in the course. NEET 2023 - Target Batch - Aryan Raj Singh 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. $$2\sqrt2$$
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):

 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 –
$\stackrel{\to }{E}=10$ $\mathrm{cos}$ $\left({10}^{7}t+kx\right)$ $\stackrel{^}{j}$ $V/m$, 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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