1.

Two sinusoidal waves with same wavelengths and amplitudes travel in opposite directions along a string with a speed `10ms^-1`. If the minimum time interval between two instant when the string is flat is `0.5s`, the wavelength of the waves isA. `25m`B. `20m`C. `15m`D. `10m`

Answer» Correct Answer - D
Minimum time interval between two instant when the string is flat`=(T)/(2)=0.5secimpliesT=1sec`
Hence `lamda=vxxT=10xx1=10m`.


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