sound travels at 343m/s in air and 1500m/s in water. Asound of 256Hz is made und

Question

sound travels at 343m/s in air and 1500m/s in water. Asound of 256Hz is made under water, but you hear the sound whilewalking along the side of the pool. In the air, the frequencyis
1. the same, but the wavelength of the sound is shorter
2. higher, but the wavelength of the sound stays the same
3. lower, but the wavelength of the sound is longer
4. lower, and the wavelength of the sound is shorter.
5. the same, and the wavelength of the sound stays thesame

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Explanation / Answer

When a sound wave travelling from one medium to anothermedium, the frequency of the wave doesnt change, only its velocityand wavelength will change. Velocity(v) of the wave is directly proportional to thewavelength () of the wave. Here the speed of the sound in air is smaller when comparedwith the speed of the sound in water. So option (1) is correct.

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