How far does light travel in one year?( This distance is knownas a light-year an

Question

How far does light travel in one year?( This distance is knownas a light-year and is used in measuring astronomical distances)______km Approximately how long would it take for a telephone signal totravel 1000mi?( telephone signals travel at about the speed oflight) _____s Compute the wavelength of an x-ray with a frequency of 8.0 x10^18 Hz.______nm How far does light travel in one year?( This distance is knownas a light-year and is used in measuring astronomical distances)______km Approximately how long would it take for a telephone signal totravel 1000mi?( telephone signals travel at about the speed oflight) _____s Compute the wavelength of an x-ray with a frequency of 8.0 x10^18 Hz.______nm

Explanation / Answer

      (a)            Lightyear = Distance traveled by light in one year                           = Velocity of light * 1 year                           = 3 x 108 m/s * 365 days                           = 3 x 108 m/s * 365 * 86400 s                           = 9.46 x 1015 m        (b)           Distance, d = 1000 mi                             = 1609 km            Speedof light, C = 3 x 108 m/s            Time,t = d / C                       = ( 1609 X 103 ) / ( 3 X 108 )                       = 5.36 x 10-3 s                       = 5.36 ms       (c)           Frequency, f= 8 X 1018 Hz           Wavelength, = C / f                                 = ( 3 X 108 ) / ( 8 X 1018 )                                 = 0.375 X 10-10 m                                 = 0.0375 nm

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