The period of a 10 kHz radio wave traveling at 108 ms−1 is?

A. 3.0 x 10−5s
B. 1.0 x 10−4 s
C. 1.0 x 104s
D. 3.0 x 104s

Correct Answer:

Option B = 1.0 x 10−4 s

Explanation

The relation between period and frequency is that one is the inverse of the other.

By definition:

Frequency = 1/period.

or

period = 1/frequency → 1/ 10,000

period = 0.0001 or 1.0 x 10−4 s