An astronaut on the moon, 384000 km from the earth\'s surface, is communicating

Question

An astronaut on the moon, 384000 km from the earth's surface, is communicating with his earth-based control centre using a single-side-band radio modulated at 5 MHz. What is the communication time-lag (e.g the time it takes to get a response from a question) between the astronaut and control centre?
ANS! 2.6 seconds
Please help! An astronaut on the moon, 384000 km from the earth's surface, is communicating with his earth-based control centre using a single-side-band radio modulated at 5 MHz. What is the communication time-lag (e.g the time it takes to get a response from a question) between the astronaut and control centre?
ANS! 2.6 seconds
Please help! An astronaut on the moon, 384000 km from the earth's surface, is communicating with his earth-based control centre using a single-side-band radio modulated at 5 MHz. What is the communication time-lag (e.g the time it takes to get a response from a question) between the astronaut and control centre?
ANS! 2.6 seconds
Please help!

Explanation / Answer

given,

distance between the astronaut and earth surface = 384000 * 10^3 m

since radio wave is an electromagnetic wave so,

speed of radio wave = 299792458 m / s

time lag in one way communication = distance between the astronaut and earth surface / speed of radio wave

time lag in two way communication = 2 * (distance between the astronaut and earth surface / speed of radio wave)

time lag in two way communication = 2 * (384000 * 10^3 / 299792458)

time lag in two way communication = 2.6 sec

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