Question

The period of a sine wave is 40ms. What is the frequency?



a.25



b.50



c.75



d.100

Answer 1

answer is 25 Hz

since, f = 1/t

here, t =40ms. =40 x 10^-3

so, f= 1/(40x10^-3)

=25 Hz

Answer 2

a) 25

Explanation:

Given,

Time = 40 ms or $40 \times 10^{3}$ s

We have to find the frequency.

We know that

The frequency of the wave in terms of time period is given by

$f = \frac{1}{T}$

Here, T is time and f is frequency.

Substitute the given values, and we get

$f = \frac{1}{40 \times 10^3}$

$f = 0.025 \times 10^3$

$f = 25 Hz$

So, the frequency of the sine wave is 25 Hz.

Frequency

The frequency is the number of waves passing through a point in a fixed amount of time. The relationship between both the wave's frequency and duration is inverse.

As a result, frequency refers to the number of times a motion repeats itself within a second. The letters T and f stand for the time period and frequency, respectively.

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