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 |
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Match List - I with List - II.
List -I (Electromagnetic waves) List - II (Wavelength)
(a) AM radio waves (i) \(10^{-10}~\mathrm{m}\)
(b) Microwaves (ii) \(10^{2} \mathrm{~m}\)
(c) Infrared radiations (iii) \(10^{-2} \mathrm{~m}\)
(d) X-rays (iv) \(10^{-4} \mathrm{~m}\)
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 |
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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.
1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Subtopic:  Generation of EM Waves |
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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  Ic if the wave is totally absorbed.
(b) Radiation pressure is Ic if the wave is totally reflected.
(c) Radiation pressure is 2Ic if the wave is totally reflected.
(d) Radiation pressure is in the range Ic< P <2Ic for real surfaces.

1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (c, d)

Subtopic:  Properties of EM Waves |
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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.  \(2\sqrt2\)
Subtopic:  Properties of EM Waves |
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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 |
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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.

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 a correct explanation of (A).
4. Both (A) and (R) are true but (R) is not a correct explanation of (A).
Subtopic:  Properties of EM Waves |
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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 |
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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 |
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The electric field of an electromagnetic wave in a free space is given by –
E=10 cos (107t+kx) 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 |
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