Question

If 20 waves are produced per second what is the frequency in hertz?

Answer 1

Hint:this is a very simple question, in fact the question itself gives the answer to this question. To answer this question we will first define what a frequency is, we will state its formula, and discuss in short the same.

Formula used:
\[f = \dfrac{1}{T}\]
Where $f$- frequency and $t$- time period.

Complete step by step answer:
How many times in a minute do you blink your eyes? This could be one way to talk about frequency. The frequency of periodic oscillations, vibrations, or waves per unit of time, measured in hertz. The frequency of anything is defined as the number of times it occurs. A person blinking 47 times in one minute is an example of frequency. We use \[f = \dfrac{1}{T}\]to calculate this.

The number of times a repeated event occurs per unit of time is known as frequency. The unit of frequency is hertz (Hz), which equals one occurrence per second. The period is the reciprocal of the frequency since it is the length of one cycle in a repeated occurrence.In this question it has been given that there are 20 waves in one second. So clearly they have given the frequency itself. (it is clear through the above explanation.)

Hence, if 20 waves are produced per second then the frequency is 20 Hz.

Note:Do not get confused if instead of frequency, the terms like temporal frequency or ordinary frequency are used. Frequency is also referred to as temporal frequency to distinguish it from spatial frequency, and ordinary frequency to distinguish it from angular frequency.