Answer : Frequency equals number of oscillations in a given period of time.
Explanation :
The number of oscillations in a given period of time is known as the frequency of the wave. It is denoted by [tex]\nu[/tex]. Its SI unit is hertz (Hz).
It is also defined as the inverse of time period i.e.
[tex]\nu=\dfrac{1}{T}[/tex]
T is the time period.
Hence, the correct option is (B) " number of oscillations in a given period of time ".
