solve this 3rd numerical
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n (frequency) = v/x (speed / wavelength?
n= 1250/2.5= 500 Hz
Time period = 1/n = 1/500 = 2×10^-3 seconds
n= 1250/2.5= 500 Hz
Time period = 1/n = 1/500 = 2×10^-3 seconds
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