In electromagnetic wave the phase difference between electric and magnetic field vectors is:
1. 0
2.
3.
4.
An electromagnetic wave going through the vacuum is described by
Which is the following is/are independent of the wavelength?
1. | \(k\) | 2. | \(k \over \omega\) |
3. | \(k \omega\) | 4. | \( \omega\) |
In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 Hz and amplitude 480 V/m. The amplitude of the oscillating magnetic field will be:
1.
2.
3.
4.
The energy density of the electromagnetic wave in vacuum is given by the relation:
1.
2.
3.
4.
A lamp radiates power uniformly in all directions. The amplitude of electric field strength at a distance r from it is:
1.
2.
3.
4.
The intensity of visible radiation at a distance of 1 m from a bulb of 100 W which converts only 5% of its power into light, is:
1. 0.4 W/m2
2. 0.5 W/m2
3. 0.1 W/m2
4. 0.01 W/m2
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 (2) 46.7
(3) 66.5 (4) 86.5
The most penetrating radiation out of the following is:
(1) X-rays (2) -rays (3) -rays (4) -rays
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
The magnetic field in a plane EM wave traveling in the positive x-direction is given by
The equation for electric field is :
1. E=100sin [(2(t-x/c)]
2. E=(3)sin [(2(t-x/c)]
3. E=3sin [(2(t-x/c)]
4. E=100sin [(2(t-x/c)]