Question

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Answer 1

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HERE IS UR ANSWER......

FREQUENCY = f = 2kHz = 2000Hz
WAVELENGTH = 35cm = 0.35 m

NOW, SPEED OF WAVE = WAVELENGTH × FREQUENCY = 0.35×2000= 700m/s

SO, TIME TAKEN BY WAVE TO TRAVEL A DISTANCE OF 1.5 km = 2.1 sec

SO, SOUND WILL TAKE 2.1 sec TO TRAVEL A DISTANCE OF 1.5 km