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- 1 8 .) see photo for detailsProblem 5. Assume that electromagnetic propagation through space is what we have been calling "free space." b) How long does it take to communicate with electromagnetic waves from Mars to Earth? Another way of asking this question is how long does it take for an electromagnetic signal originating on Mars to reach Earth? c) for two humans separated by 6 feet, how long does it take for the light reflected off of one person to be seen by the other person?4. The magnetic field strength of a wave in a vacuum is given by H= 0.2 cos(10°t - By) a, A/m. In this situation. a) Find the phase constant and wavelength. b) Find the phase velocity and give the direction of wave propagation c) Give the intensity of the electric field for y=1 cm and = 0.1 ns. d) Define the polarization of the wave on the x-y-z plane and draw the polarization site. 3
- 10.) The speed of electromagnetic waves is a. different for each frequency in a vacuum b. less in a vacuum than in water c. 300,000 km/s in a vacuum d. faster than the speed of light in a vacuum4. A spotlight shines onto a square target of area 0.35 m?. If the average rms strength of the magnetic field in the EM waves of the spotlight is 1.2 x 107 T, calculate the energy transferred to the target if it remains in the light for 12 minutes. (Give answer in joules) F3 FB #3 2$ 4 & * 2 3 5 8 9 W E T U K35. Identify which list of characteristics is true for the light wave shown in the sketch below. origin λ = 750 nm A. UV light with a frequency of 4.0x10¹4 Hz B. Red light with an amplitude of about 500 nm C. Infrared light with a frequency of 4.0x10¹4 Hz D. Infrared light with a frequency of 2.2x10¹4 Hz E. UV light with cy of 2.2x10¹4 Hz