006 10.0 points Radio and TV transmissions are being emit- ted into space, so St
ID: 2040423 • Letter: 0
Question
006 10.0 points Radio and TV transmissions are being emit- ted into space, so Star Thek episodes are streaming out into the universe. The near- est star is 2 x 1017 m meters away. If civilized life exists on a planet near this star, how long will they have to wait for the next episode? Answer in units of years. 007 (part 1 of 2) 10.0 points If the frequency of the wave used by your favourite station is 97.7 Megahertz, what is the wavelength? Answer in units of m. 008 (part 2 of 2) 10.0 points If the station is 50 km away, how long does it take for the radio waves to reach you from the station? Answer in units of seconds.Explanation / Answer
006: t = d / v
t = (2 x 10^17 m) / (3 x 10^8 m/s)
t = 6.67 x 10^8 sec
t (in years) = (6.67 x 10^8) / (365 x 24 x 3600)
= 21.1 years ......Ans
007: wavelength = c / f
= (3 x 10^8 m/s) / (97.7 x 10^6 Hz)
= 3.07 m
008: t = d / c = (50 x 10^3) / (3 x 10^8)
t = 1.67 x 10^-4 s
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