Electromagnetic Waves Question Bank

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1. If c is the speed of electromagnetic wave in vacuum, its speed in a medium of dielectric constant K and relative permeability \mu, is
A.
B.
C.
D.
E.
2. Which has minimum wavelength ?
A.
B.
C.
D.
3. A point source of electromagnetic radiations has an average power output of 1500W. The maximum value of electric field at a distance of 3m from this source in Vm^{-1} is
A.
B.
C.
D.
E.
4. The electromagnetic theory of light failed to explain
A.
B.
C.
D.
5. A charged particle oscillates about its mean equilibrium position with a frequency of 10^{9}Hz. Frequency of the electromagnetic waves produced by the oscillator is
A.
B.
C.
D.
6. An electromagnetic wave has
A.
B.
C.
D.
7. Ozone layer in atmosphere absorbs
A.
B.
C.
D.
8. The magnetic field of  an electromagnetic wave in given by

B_{Y}=3\times10^{-7}sin(10^{3}x+6.28\times10^{12}t).

The wavelength of the electromagnetic wave is
A.
B.
C.
D.
9. A layer of ionosphere does not reflect waves with frequencies greater than 10MHz; then maximum electron density in this layer is
A.
B.
C.
D.
10. Velocity of electromagnetic wave in a medium depends upon
A.
B.
C.
D.
E.