Please help me . I cannot understand how the calculation is done here.
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I know
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it is my answer you see and then do it
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i will tell u :
see Time period is the time taken in 1 complete oscillation.
therefore time taken for 1 oacillation T = 4/40=0.1
and we know that frequency is reciprocal of time period
therefore frequency =1/T =10 Heartz
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