Question

If the frequency of a sound is 400 Hz, what is its time period?​

Answer 1

Frequency is reciprocal of time period.

i.e.

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

where f = frequency

t = time period

so

$400 \: = \frac{1}{t}$

$t = \frac{1}{400}$

$t = 0.0025 \: sec$

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Answer 2

Answer : 0.0025s

Explanation:

Frequency = 1 / Time period

                   = 1/ 400

                   = 0.0025