Section - Multiple choice (+2 points each) 1. Electromagnetic radiation having a

Question

Section - Multiple choice (+2 points each) 1. Electromagnetic radiation having a frequency of 450 MHz classified as a microwave. Which of the following is the wavelength of the wave? A. 1.4 m B. 32 cm C. 67 cm D. 45 cm E. 1.5m 2. A linearly polarized beam of light is incident upon a group of three polarizing sheets which are arranged so that the transmission axis of each sheet is rotated by 45" with respect to the preceding sheet as shown. What fraction of the incident intensity is transmitted? 45° So 90° Stransmitted A. 1/8 B. 3/8 C. 1/4 E. 3/4

Explanation / Answer

here,

1)

the frequency of microwave , f = 450 MHz

f = 4.5 * 10^8 Hz

the speed of light , c = 3 * 10^8 m/s

the wavelength of wave , lamda = c/f

lamda = 3 * 10^8 /( 4.5 * 10^8) m

lamda = 0.67 m = 67 cm

the wavelength of wave is C) 67 cm

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