The speed of light depends:

 1 on elasticity of the medium only. 2 on inertia of the medium only. 3 on elasticity as well as inertia. 4 neither on elasticity nor on inertia.
Subtopic:  Properties of EM Waves |
66%
From NCERT
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The equation of a light wave is written as $$y = A sin (kx-\omega t)$$. Here, y represents

1. displacement of ether particles

2. pressure in the medium

3. density of the medium

4. electric field

Subtopic:  Properties of EM Waves |
From NCERT
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When light propagates in vacuum there is an electric field and a magnetic field. These fields,

 a. are constant in time b. have zero average value c. are perpendicular to the direction of propagation of light d. are mutually perpendicular

Choose the correct option:

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

Subtopic:  Properties of EM Waves |
86%
From NCERT
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Three observers A, B and C measure the speed of light coming from a source to be VA, VB and VC. The observer A moves towards the source and C moves away from the source at the same speed. The observer B stays stationary. The surrounding space is vacuum everywhere.

(a) $$v_{A}>v_{B}>v_{C}$$

(b) $$v_{A}<v_{B}<v_{C}$$

(c) $$v_{A}=v_{B}=v_{C}$$

(d) $$v_{B}=\frac{1}{2}\left(v_{A}+v_{C}\right)$$

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. All of these

Subtopic:  Properties of EM Waves |
66%
From NCERT
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Dimensions of 1/(µ0ε0) is

1.   L/T

2.   T/L

3.   L2/T2

4.   T2/L2

Subtopic:  Properties of EM Waves |
66%
From NCERT
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An electromagnetic wave going through vacuum is described by;
$$E=E_0 \sin (k x-\omega t) ; B=B_0 \sin (k x-\omega t).$$
Then:
1. $$E_0 k=B_0 \omega$$
2. $$E_0 B_0=\omega k$$
3. $$E_0 \omega=B_0 k$$
4.  none of these

Subtopic:  Properties of EM Waves |
78%
From NCERT
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An electric field $$\vec{E}$$ and a magnetic field $$\vec{B}$$  exist in a region. The fields are not perpendicular to each other.

1.  This is not possible.

2.  No electromagnetic wave is passing through the region.

3.  An electromagnetic wave may be passing through the region.

4.  An electromagnetic wave is certainly passing through the region.

Subtopic:  Properties of EM Waves |
From NCERT
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Consider the following two statements regarding a linearly polarized, plane electromagnetic wave:

(A) The electric field and the magnetic field have equal average values.

(B) The electric energy and the magnetic energy have equal average values.

1.  Both A and B are true

2.  A is false but B is true

3.  B is false but A is true

4.  Both A and B are false

Subtopic:  Properties of EM Waves |
63%
From NCERT
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A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving

1.  along the electric field

2.  along the magnetic field

3.  along the direction of propagation of the wave

4.  in a plane containing the magnetic field and the direction of propagation

Subtopic:  Properties of EM Waves |
From NCERT
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An electromagnetic wave going through vacuum is described by

E = E0 sin(kx – ωt)

Which of the following is/are independent of the wavelength?

(a) k
(b) ω
(c) k/ω
(d) kω

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c) only

4. (a), (d)

Subtopic:  Properties of EM Waves |
70%
From NCERT
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