Question

The frequency of sound waves can not be expressed in

• A. Hz
• B. cycles
• C. $s^{-1}$
• D. all the above

Answer 1

The correct option is B

cycles

The explanation for the correct option:

cycles:

1. The wavelength is defined as the length of one complete wave cycle.
2. Therefore, one wavelength is referred to as a cycle of a wave.

The explanation for incorrect options:

1. Hertz is the unit of frequency and frequency is defined as the number of vibrations per second.
2. Hence, the number of vibrations per second, which gives frequency in, $secon{d}^{-1}=Hertz$

Hence, option (b) is correct.