On an EM wave, the amplitude of electric and magnetic fields are 100 v/m and 0.265 A/m.  The maximum energy flow is

(1) 26.5 W/m2           (2) 46.7 W/m2

(3) 66.5 W/m2            (4) 86.5 W/m2

Subtopic:  Properties of EM Waves |
 61%
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The most penetrating radiation out of the following is: 

(1) X-rays        (2) β-rays            (3) α-rays           (4) γ-rays

Subtopic:  Properties of EM Waves |
 77%
From NCERT
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Which of the following statements about electromagnetic waves is/are correct:

A. X-rays in vacuum travel faster than light waves in vacuum.
B. The energy of an X-ray photon is greater than that of a light photon.
C. Light can be polarised but X-ray cannot.

1. A and B 
2. B and C
3. A, B and C
4. B only

Subtopic:  Electromagnetic Spectrum |
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The magnetic field in a plane EM wave traveling in the positive x-direction is given by 

B=(100μT) sin [(2×1015s-1)(t-x/c)]j^

The equation for electric field is :

1. E=100sin [(2×1015s-1)(t-x/c)]-k^

2. E=(3×1010 μV/m)sin [(2×1015s-1)(t-x/c)]-k^

3. E=3×1010sin [(2×1015s-1)(t-x/c)] k^

4. E=100sin [(2×1015s-1)(t-x/c)] k^

Subtopic:  Properties of EM Waves |
 60%
From NCERT
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Statement I: A changing electric field produces a magnetic field.

Statement II: A changing magnetic field produces an electric field.

(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:  Generation of EM Waves |
 59%
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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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