Question

A turning fork vibrates at 256 Hz. How many times does one of its prongs vibrate back and forth in 5 seconds

Answer 1

First find time period

`\\ \bull\tt\longrightarrow Frequency=(1)/(Time\:Period)`

`\\ \bull\tt\longrightarrow Time\:Period=(1)/(Frequency)`

`\\ \bull\tt\longrightarrow Time\:Period=(1)/(256)=0.003s`

Now

`\\ \bull\tt\longrightarrow No\:of\:times\:it\:vibrate=5(0.003)=0.015times`