time period of 2 second the following wave pattern is observed that the frequency of wave in hertz

Dear student,

The given waveform is recorded in a total time of 2 second.


Each dot on the waveform marks one complete cycle.
Hence in a total of 2 seconds, there are 4 complete cycles of the waveform.
The total complete cycle completed in 1 second is called frequency of the waveform.
Since in 2 seconds, 4 complete cycles are completed.
In 1 second, total complete cycles = 2. 
Hence the frequency is 2 Hz.
Correct answer is option (b) 

Regards

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