A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 10⁶ m? A) 0.15 × 10^-2 s B) 15 ms C) 6.7 × 10^-2 s D) 20 ms E) 25 ms

Question

Quizplus · Accepted Answer

The formula for calculating the time taken for a radio signal to travel a distance is given by:

time = distance/speed of light

The speed of light is a constant and is approximately equal to 3 × 10^8 meters per second. Therefore,

time = distance/speed of light = (20 × 10^16)/3 × 10^8 = 6.67 × 10^-5 seconds

This is equal to 6.7 × 10^-2 milliseconds or 67 microseconds. Therefore, the best choice is C.

A Radio Station Broadcasts at 80 MHz