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Q. No.An incident light beam of power \(P\) falls on a flat surface, at an angle of incidence of \(60^{\circ}.\) \(50\%\) of the beam is absorbed and the remaining reflected. The force exerted on the surface is:
1.
\(\dfrac{P}{c}\)
2.
\(\dfrac{P}{2c}\)
3.
\(\dfrac{\sqrt3P}{c}\)
4.
\(\dfrac{\sqrt3P}{2c}\)
Subtopic: Â Properties of EM Waves |
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In a plane polarised electromagnetic wave of wavelength \(\lambda,\) the electric field at a certain point \(P\) has the value \(\vec E_P(t).\) At a different point \(Q,\) the electric field is \(\vec E_Q(t).\) If \(\vec E_{P}\) and \(\vec E_{Q}\) are in phase with each other, then the component of \(\overrightarrow {PQ}\) along the direction of propagation equals:
| 1. | Zero |
| 2. | \(\lambda\) |
| 3. | \(n\lambda,\) where \(n\) is an integer |
| 4. | \(2n\lambda,\) where \(n\) is an integer |
Subtopic: Â Properties of EM Waves |
 53%
From NCERT
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A plane electromagnetic waveform given by: \(\vec {E}_1=E_0\hat j\sin(\omega t-kx)\)
propagates along the \(x\)-axis. A second waveform given by: \(\vec {E}_2=E_0\hat k\sin(\omega t-kx)\)
is also allowed to propagate. The magnetic field has the amplitude: (Assume speed of light in vacuum is \(c\))
propagates along the \(x\)-axis. A second waveform given by: \(\vec {E}_2=E_0\hat k\sin(\omega t-kx)\)
is also allowed to propagate. The magnetic field has the amplitude: (Assume speed of light in vacuum is \(c\))
| 1. | \(\dfrac{E_0}{c}\) | 2. | \(\dfrac{E_0}{2c}\) |
| 3. | \(\dfrac{\sqrt2E_0}{c}\) | 4. | Zero |
Subtopic: Â Properties of EM Waves |
 65%
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:
\(\vec E_1(x,t)=E_1\hat j~\sin(\omega t-k_0x),\) 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: Â Properties of EM Waves |
 67%
From NCERT
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When an electromagnetic wave of frequency \(f_0\) undergoes refraction at the interface of two transparent (non-absorbing) media, the frequency of the transmitted wave is \(f_t.\) Then:
| 1. | \(f_t=f_0\) |
| 2. | \(f_t>f_0\) |
| 3. | \(f_t<f_0\) |
| 4. | \(f_t\neq f_0\) |
Subtopic: Â Properties of EM Waves |
 77%
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: Â Generation of EM Waves |
 61%
From NCERT
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Given below are two statements:
| Statement I: | Electromagnetic waves propagate through all media with a speed \(c=\dfrac{1}{\sqrt{\varepsilon_0\mu_0}}.\) |
| 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: Â Properties of EM Waves |
 54%
From NCERT
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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: Â Properties of EM Waves |
 67%
From NCERT
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Which of the following situation(s), can cause the radiation of an electromagnetic wave?
Choose the correct options:
| (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 |
Choose the correct options:
| 1. | only (A) |
| 2. | only (B) |
| 3. | only (A) & (B) |
| 4. | (A), (B), (C) |
Subtopic: Â Generation of EM Waves |
 66%
From NCERT
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A plane electromagnetic wavefront is incident at an angle of \(30^{\circ}\) onto a flat surface. The difference between the arrival times of the wave at the points \(A\) and \(B\) is \(T,\) where \(AB=L.\) Then, the speed of the wavefront in the medium is:
| 1. | \(\dfrac{L}{T}\) | 2. | \(\dfrac{2L}{T}\) |
| 3. | \(\dfrac{L}{2T}\) | 4. | \(\dfrac{\sqrt3L}{T}\) |
Subtopic: Â Properties of EM Waves |
 62%
From NCERT
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