ANSWER
2 Hz
EXPLANATION
The period of a periodic wave is the time one complete cycle of the wave lasts. The frequency is the number of cycles per second.
The relationship between the period and the frequency of a wave is that each is the reciprocal of the other. In other words,
[tex]T=\frac{1}{f}\text{ }and\text{ }f=\frac{1}{T}[/tex]So, if the period of this wave is T = 0.50 s, then the frequency is,
[tex]f=\frac{1}{0.50s}=2Hz[/tex]Hence, the frequency of this periodic wave is 2 cycles per second or Hertz.
