Answer:
B) 0.333 Hz
Explanation:
Lets see what are the main properties of a wave
- The frequency of a wave is the number of times per second that the wave cycles. - measured in Hertz (Hz)
- wave crest is shown in the figure.
- wavelength of a wave is the distance between corresponding points of two consecutive waves.
- The period of the wave is the time between wave crests
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The amplitude of a wave is a measure of the displacement of the wave from its rest position
observer sees 4 crests in 12 seconds
according to this , the number of crests he sees in a minute
[tex]frequency=\frac{4}{12} =0.333 Hz[/tex]
