Which of the following properties of sound is affected by the change in temperature of the atmosphere?I. VelocityII. FrequencyIII. Wavelength
Correct answer: A. I only.
- A. I only.
- B. III only.
- C. I and II.
- D. II and III.
Explanation
The velocity of sound is affected by temperature because sound travels faster in warmer air, due to the increased speed of air molecules. Frequency is not affected by the medium or temperature; it is determined by the source of the sound wave. Wavelength is dependent on both frequency and velocity, following the equation v = fλ (velocity = frequency x wavelength). Since frequency remains constant and velocity increases with temperature, the wavelength must also increase. Therefore, only velocity (I) is directly affected by temperature changes in the atmosphere.
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About Speed of Sound
The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
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