A radio station broadcasts at a frequency of 80 MHz.How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 10⁸ m/s) A)60 × 10⁶ m B)67 m C)40 km D)80 km E)20 × 10⁶ m

Question

Quizplus · Accepted Answer

We can use the formula: distance = speed x time
distance = (speed of light / frequency) x time
distance = (3.0 x 10^8 / 80 x 10^6) x 67 x 10^-3
distance = 20 x 10^3 = 20 km = 20 x 10^16 cm
The answer choice closest to this is E, 20 x 10^16 cm or 20 x 10^10 m.

A Radio Station Broadcasts at a Frequency of 80 MHz