There are 2 waves passing through a point every second, defining the frequency as 2 Hertz.
Step-by-step explanation:
Wave Frequency
The frequency of a wave is defined as the number of waves passing through a particular point in the medium per second. The unit of frequency is Hertz (Hz).
For example, if the frequency of a violin note is 440 Hz; this means that 440 vibrations or waves pass through a single point of medium in every single second.
Now, here in the case, the frequency is given as 2 Hz i.e, 2 waves are passing through a point in every single second or we can simply say that the total number of waves through a particular point is 2.