Statement-I: Gamma rays are more energetic than X-rays.

Statement-II: Gamma rays are of nuclear origin but X-rays are produced due to sudden deceleration of high energy electrons while falling on a metal of high atomic number.

(1) If both statement-I and Statement-II are true, and Statement-II is the correct explanation of Statement-I.

(2) If both Statement-I and Statement-II are true but Statement-II is not the correct explanation of Statement-I.

(3) If Statement-I is true but Statement-II is false.

(4) If Statement-I is false but Statement-II is true.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Properties of EM Waves |
 55%
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The S.I. unit of displacement current is:
1. Henry
2. Coulomb
3. Ampere
4. Farad

Subtopic:  Displacement Current |
 88%
From NCERT
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The relation between electric field E and magnetic field intensity H in an electromagnetic wave is:

(1) E = H

(2) E=μ0ε0H

(3) E=ε0μ0H

(4) E=μ0ε0H

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

E=E0sin(kx-ωt)
B=B0sin(kx-ωt)

(1) E0B0=ωk

(2) E0ω=B0k

(3) E0k=B0ω

(4) none of these

 

Subtopic:  Properties of EM Waves |
 74%
From NCERT
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The ratio of E0H0 for a plane electromagnetic wave has the dimension of

(1) Impedance

(2) Resistance

(3) Both 

(4) None

Subtopic:  Properties of EM Waves |
From NCERT
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If an electromagnetic wave going through a medium is given by; 
\(E=E_{0}sin\left ( kx-\omega t \right )\) and \(B=B_{0}sin\left ( kx-\omega t \right ),\) then:

1. E0k=B0ω
2. If the electric field is in the z-direction then the magnetic field should be in the -y direction
3. Both 1 and 2 are correct
4. Only 1 is correct
Subtopic:  Properties of EM Waves |
 68%
From NCERT
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A plane E M wave of frequency 25 MHz travels in free space in the x-direction. At a particular point in space and time E=6.3 j^ V/m then B at the point is 

(1) 2.1×10-8 -k^

(2) 2.1×10-8 k^

(3) 2.1 k^

(4) 2.1×10-8 i^

Subtopic:  Properties of EM Waves |
 81%
From NCERT
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In an electromagnetic wave, the amplitude of electric field is 1 V/m. The frequency of wave is 5×1014 Hz. The wave is propagating along Z-axis. The average energy density of electric field in joule/m3, will be

(1) 2.2×10-12

(2) 4.4×10-12

(3) 6.6×10-12

(4) 8.8×10-12

Subtopic:  Properties of EM Waves |
 58%
From NCERT
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The infra-red spectrum lies between :

(1) radio wave and microwave region

(2) the micro-wave and visible region

(3) the visible and ultraviolet region

(4) the ultraviolet and the X-ray region

Subtopic:  Properties of EM Waves |
 83%
From NCERT
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Consider an electric charge oscillating with a frequency of 10 MHz. The radiation emitted will have a wavelength equal to:

1. 20 m 2. 30 m
3. 40 m 4. 10 m
Subtopic:  Properties of EM Waves |
 89%
From NCERT
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