Electromagnetic Waves and Spectrum

If the electric field of a plane wave is ^{$\overrightarrow{E}$} (z, t) = x³ cos (wt - kz + 30^o) – y⁴ sin (wt - kz + 45^o) (mV/m), the polarization state of the plane wave is

For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a reduction of the spacing between the plates by a factor of two results in

The electric field component of a time harmonic plane EM wave traveling in a nonmagnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is

Directions: Carry One Mark Each.

The electric field of a uniform plane electromagnetic wave is

$\overrightarrow{E} = (\overrightarrow{a_z} + j4 \overrightarrow{a_y})exp[j(2 \pi \times 10^7 t - 0.2z)]$

The polarization of the wave is

Directions: Carry Two Marks Each.

The electric field of a plane wave that is propagating in a lossless non-magnetic medium is given by

E(z, t) = a_x 5 cos(2^_$\pi$ x 10⁹ t + ^_$\beta$z) + a_y3 cos x (2^_$\pi$ x 10⁹t + ^_$\beta$z - ^{$\frac{\pi}{2}$})

The polarization is

Consider a lossless antenna with a directive gain of 6 + dB. If 1 mW of power is fed to it, the total power radiated by the antenna will be

Consider the following electromagnetic waves:

1. X-rays 2. م-rays
2. Microwaves 4. Radio waves What is the correct sequence in the order of their increasing energy?

Which of the following statements about electromagnetic spectrum is/are not correct?

(A) The velocity of X-rays is more than that of microwaves. (B) X-rays have larger wave number than microwaves. (C) The frequency of microwaves is less than that of ultraviolet rays.