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Statement I: Intensity of sound wave cha...

Statement I: Intensity of sound wave changes when the listener moves towards or away from the stationary source.
Statement II: The motion of listener causes the apparent change in wavelength.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, we will evaluate each statement separately and determine their validity based on the principles of wave physics. ### Step-by-Step Solution: **Step 1: Evaluate Statement I** - **Statement I:** "Intensity of sound wave changes when the listener moves towards or away from the stationary source." - **Explanation:** The intensity of a sound wave is defined as the power per unit area carried by the wave. When a listener moves towards a stationary sound source, they encounter more sound waves per unit time, which increases the intensity perceived by the listener. Conversely, if the listener moves away from the source, they encounter fewer sound waves per unit time, leading to a decrease in perceived intensity. Thus, this statement is **correct**. **Step 2: Evaluate Statement II** - **Statement II:** "The motion of the listener causes the apparent change in wavelength." - **Explanation:** The wavelength of a sound wave is determined by the source and the medium through which it travels. When a listener moves towards or away from the source, the frequency of the sound waves perceived by the listener changes due to the Doppler effect. However, the actual wavelength of the sound does not change unless the medium itself changes (like wind). Therefore, this statement is **incorrect**. ### Conclusion: - **Statement I is correct.** - **Statement II is incorrect.** ### Final Answer: - Statement I is true, and Statement II is false. ---
To analyze the given statements, we will evaluate each statement separately and determine their validity based on the principles of wave physics. ### Step-by-Step Solution: **Step 1: Evaluate Statement I** - **Statement I:** "Intensity of sound wave changes when the listener moves towards or away from the stationary source." - **Explanation:** The intensity of a sound wave is defined as the power per unit area carried by the wave. When a listener moves towards a stationary sound source, they encounter more sound waves per unit time, which increases the intensity perceived by the listener. Conversely, if the listener moves away from the source, they encounter fewer sound waves per unit time, leading to a decrease in perceived intensity. Thus, this statement is **correct**. ...
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