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Extrinsic Semiconductors

Which of the ...

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Which of the following physical quantities contained in a small volume oscillates at double the frequency of passing electromagnetic wave ? (1 ) Electric field (2 ) Magnetic field (3) Magnetic energy ( 4) All of these (Also give the mathematical reason)

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Q. A plane electromagnetic wave is passing through a region. Consider (a) electric field (b) magnetic field (c) electrical energy in a small volume and (d) magnetic energy in a small volume. Construct the pairs of the quantities that oscillate with equal frequencies.

Q. The energy contained in a small volume through which an electromagnetic wave is passing oscillates with
(a) zero frequency
(b) the frequency of the wave
(c) half the frequency of the wave
(d) double the frequency of the wave

Q. Which of the following have zero average value in a plane electromagnetic wave?
(a) Electric field
(b) Magnetic field
(c) Electric energy
(d) Magnetic energy

Q. Which of the following have zero average value in a plane electromagnetic wave?
(i) Magnetic field
(ii) Electric field
(iii) Electric energy
(iv) Magnetic energy.

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of

2.0 \times 10^{10} H z

48 V m^{- 1}

(a) What is the wavelength of the wave?

(b) What is the amplitude of the oscillating magnetic field?

(c) Show that the average energy density of the E field equals the average energy density of the B field. [c = 3

\times 10^{8} m s^{- 1}

]

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