Electromagnetic Waves Question Bank

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1. All components of the electromagnetic spectrum in vacuum have the same
A.
B.
C.
D.
2. Electromagnetic waves of frequencies higher than 9\sqrt{2}MHz are found to be reflected by the ionosphere on a particular day at a place. The maximum electron density in the ionosphere is
A.
B.
C.
D.
E.
3. A . The wavelength of microwaves is greater than that of UV-rays.

B . The wavelength of IR rays is lesser than that of UV-rays.

C . The wavelength of microwaves is lesser than that of IR rays.

D . Gamma rays have shortest wavelength in the electromagnetic spectrum.

Of the above statements
A.
B.
C.
D.
E.
4. The frequency order \gamma rays (A), X rays (B) and UV rays (C)
A.
B.
C.
D.
5. Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Speeds of electromagnetic waves in this medium will be
A.
B.
C.
D.
6. If 150\,J of energy in incident on area 2m^{2}. If Q_{r}=15\,J, coefficient of absorption is 0.6, then amount of energy transmitted is
A.
B.
C.
D.
7. The electric field of an electromagnetic wave traveling through vacuum is given by equation E=E_{0}sin(kx-\omega\,t). The quantity that is independent of wavelength is
A.
B.
C.
D.
E.
8. The electric field of a plane electromagnetic wave varies with time of amplitude 2Vm^{-1}  propagating along z-axis. The average energy density of the magnetic field is (in Jm^{-3})
A.
B.
C.
D.
E.
9. Speed of electromagnetic waves is same
A.
B.
C.
D.
10. If \varepsilon_{0} and \mu_{0} are the electric permittivity and magnetic permeability of free space and \varepsilon and \mu are the  corresponding quantities in the medium, the index of refraction of the medium in terms of above parameters is
A.
B.
C.
D.