Question

What is the period of a wave that has a frequency of 400 Hz?

Answer 1

Period represented as "T" equals 1 over frequency, "f" (
`T=(1)/(f)`).

`\Longrightarrow T=(1)/(f)` ; f=400 Hz

`\Longrightarrow T=(1)/((400 \ Hz))` Note that:
`Hz=s^(-1) \ or (1)/(s)`

`\Longrightarrow T=(1)/((400 \ (1)/(s) ))`

`\Longrightarrow T= \boxed{(1)/(400) \ s}`

The last option is correct.

Answer 2

Answer:1/400s

Explanation: Frequency is equal to 1 divided by period therefore period is going to be 1 divided by frequency