Topic: Electromagnetic Theory
The phase velocity of a plane wave given by E_x = E_0 cos(wt-bz) with a frequency of 5.0 GHz and a wavelength in the material medium of 3.0 cm is:
- A. 3.0 x 10^8 m/sec
- B. 1.5 x 10^8 m/sec
- C. 5 x 10^8 m/sec
- D. None
Answer: B. 1.5 x 10^8 m/sec
Explanation: Given f = 5 GHz, wavelength = 3 cm. Phase velocity of plane wave = w/b = f * wavelength = 5 x 10^9 x 3 x 10^-2 = 15 x 10^7 m/sec = 1.5 x 10^8 m/sec.