Question

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Answer 1

Hint: Recall the definition of frequency i.e., number of oscillations or vibrations per second and if students find the number of oscillations or vibrations in one second then they will easily explain the number of repetitions in a minute.

Complete step by step answer:
The frequency is the number of complete cycles or vibrations in per unit of time. Also, it can be defined as the number of oscillations per second.
Frequency is measured in cycles per second or hertz (Hz)
Here it is given that the frequency of a source of sound is 100 Hz then it means that the number of compressions and rarefactions passing a given point in 1 second are 100.
So, in a minute number of compressions and rarefactions passing a given point will be
=100×60
=6000
Hence, the given source of sound vibrates 6000 times in a minute.

Additional Information:
For a longitudinal wave, the frequency is the number of successive compressions or rarefactions passing a given point in 1 second.
Hertz is the unit of frequency. The number of hertz (Hz) equals the number of cycles per second. The frequency of any phenomenon with regular periodic variations can be expressed in hertz, but the term is used most frequently in connection with alternating electric currents, electromagnetic waves (light, radar etc.), and sound.

Note: Students should understand the definition of frequency for both kinds of waves that are longitudinal and transverse waves so that they can give answers to this type of questions easily.