Which one of the following statements about the speed of sound waves i

Which one of the following statements about the speed of sound waves is not correct?

[amp_mcq option1=”The speed of sound waves in steel is higher than that in water.” option2=”The speed of sound waves in air decreases with increase in temperature.” option3=”The speed of sound waves in air increases with increase in temperature.” option4=”The speed of sound waves in water is higher than that in air.” correct=”option2″]

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UPSC NDA-2 – 2022

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The statement that the speed of sound waves in air decreases with increase in temperature is incorrect.

– The speed of sound is generally highest in solids, lower in liquids, and lowest in gases. This is because molecules are closer together and interact more strongly in denser media, allowing vibrations to propagate faster.
– The speed of sound in steel is higher than in water, and the speed of sound in water is higher than in air.
– The speed of sound in a gas (like air) increases with increasing temperature. As temperature rises, the average kinetic energy of the gas molecules increases, and they collide more frequently and vigorously, allowing the sound wave to travel faster.

The speed of sound in dry air at 0°C is approximately 331.3 m/s. For every degree Celsius increase in temperature, the speed increases by about 0.6 m/s. Therefore, speed increases with temperature.

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