An electric razor in Europe completes 50 vibrations in 1 s.The frequency of these vibrations is
A)50 Hz with a period of 1/50 s.
B)1/50 Hz with a period of 50 s.
C)50 Hz with a period of 50 s.
D)1/50 Hz with a period of 1/50 s.

Question

Quizplus · Accepted Answer

The frequency of these vibrations is the number of vibrations per second, which is given as 50 in the question. The unit of frequency is hertz (Hz).
So, the frequency of the razor is 50 Hz. 
The period of a wave is the time taken for one complete vibration or cycle, and it is the inverse of frequency. So, period = 1/frequency.
In this case, the period = 1/50 s. Therefore, option A is the correct choice.

An Electric Razor in Europe Completes 50 Vibrations in 1