Question

if a sound wave takes 20 seconds to complete a wave cycle what is its frequency​

Answer 1

Answer:

Frequency is the number of vibration per second.

So in this case the frequency of the wave is:

f=

2.5

20

Hz =8 Hz

Answer 2

Explanation:

Frequency is the number of vibration per second.

So in this case the frequency of the wave is:

f=2.520Hz =8 Hz