Which one of the following statements is NOT correct?a)The velocity of...
The velocity of sound in air increases as the humidity increases.
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Which one of the following statements is NOT correct?a)The velocity of...
**Explanation:**
The correct answer is option 'c' - The velocity of sound in air decreases as the humidity increases.
**Velocity of Sound in Air:**
The velocity of sound in air refers to the speed at which sound waves travel through the air. It depends on various factors such as temperature, pressure, and humidity.
**a) The velocity of sound in air increases with the increase of temperature:**
This statement is correct. The velocity of sound in air is directly proportional to the temperature of the air. As the temperature increases, the molecules of air gain more kinetic energy and vibrate more rapidly, which leads to an increase in the speed of sound. This relationship is known as the Gay-Lussac's law.
**b) The velocity of sound in air is independent of pressure:**
This statement is correct. The velocity of sound in air is not affected by changes in pressure. The pressure of the air only affects the density of the air, but not the speed at which sound waves travel through it. Therefore, the velocity of sound in air remains constant regardless of changes in pressure.
**c) The velocity of sound in air decreases as the humidity increases:**
This statement is incorrect. The velocity of sound in air is not significantly affected by changes in humidity. Humidity refers to the amount of water vapor present in the air. While water vapor molecules can absorb some sound energy, the effect of humidity on the velocity of sound is relatively small and negligible compared to the effects of temperature and pressure.
**d) The velocity of sound in air is not affected by the change in amplitude and frequency:**
This statement is correct. The velocity of sound in air is not affected by changes in the amplitude (loudness) or frequency (pitch) of the sound wave. These factors only affect the properties of the sound wave itself, but not the speed at which it travels through the air.
In conclusion, the statement that is NOT correct is option 'c' - The velocity of sound in air decreases as the humidity increases.
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