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Frequency =100 times
=> 0.5 m long =wavelength /2
=> wavelength=0.5×2=1 m
Now velocity = wavelength × Frequency=100×1=100 m/s
After stretched,
=> 0.4 m long =wavelength /2
=> wavelength=0.4×2=0.8m
=>New frequency = velocity /new wavelength
=>New frequency =100/0.8 = 125 times
=> 0.5 m long =wavelength /2
=> wavelength=0.5×2=1 m
Now velocity = wavelength × Frequency=100×1=100 m/s
After stretched,
=> 0.4 m long =wavelength /2
=> wavelength=0.4×2=0.8m
=>New frequency = velocity /new wavelength
=>New frequency =100/0.8 = 125 times
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