Alan has tuned his radio to 101.5 FM, which is 101.5 Khz. If the wavelength of this frequency is about 1 meter, then how long does it take music to reach him from his radio station 10 km away?
A)0)0001 seconds
B)0)001 seconds
C)0)01 seconds
D)0)1 seconds
E)0)28 seconds

Question

Quizplus · Accepted Answer

The radio wave travels very quickly, and will reach Alan in 0.1 seconds (actually just a bit less). In the wave equation, v = ?*f, so v = 101,500 * 1, or 101,500 m/s. Thus, the time it takes to travel 10 km is 10,000 m / 101,500 m/s, or about 0.098, rounded to 0.1 seconds.

Alan Has Tuned His Radio to 101