Home
Class 12
PHYSICS
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.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will break down the concepts involved and evaluate each statement step by step. ### Step-by-Step Solution: 1. **Understanding Statement I**: - Statement I claims that the intensity of a sound wave changes when the listener moves towards or away from a stationary source. - According to the Doppler effect, when a listener moves towards a stationary sound source, the frequency of the sound wave appears to increase, and when moving away, the frequency appears to decrease. - The intensity of sound is related to the square of the amplitude of the wave, which is also affected by the frequency. As the listener moves, they perceive a different intensity due to the change in frequency. **Conclusion for Statement I**: True. 2. **Understanding Statement II**: - Statement II asserts that the motion of the listener causes an apparent change in wavelength. - However, if the source of sound is stationary, the wavelength of the sound does not change; it remains constant. The change in frequency perceived by the listener is due to their motion, but the wavelength remains the same as long as the source is not moving. - Wavelength changes only if the source is moving or if there are other factors like wind affecting the sound waves. **Conclusion for Statement II**: False. 3. **Final Evaluation**: - Statement I is true, while Statement II is false. Therefore, the correct conclusion is that the first statement is true, and the second statement is false. ### Final Answer: - **Statement I**: True - **Statement II**: False
Promotional Banner

Topper's Solved these Questions

  • WAVES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT ( SECTION-C ( Previous year Questions ))|53 Videos

  • WAVE OPTICS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-J (Aakash Challengers question))|1 Videos

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - D)|13 Videos

Similar Questions

Explore conceptually related problems

The way the fringe pattern changes when the sceen is moved away from the slits is

statement I: The intensity of a plane progressive wave does not change with change in distance from the source. Statement II: The wavefronts associated with a plane progressive wave are planar.

An observer moves towards a stationary source of sound. The percentage change in the apparent frequency is

Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected waves will be

When source of sound moves towards a stationary observer, the wavelength of sound received by him

Staement I: pressure and density change do not occure in a transverse stationary wave. Statement II: the average distance between any two particles of the wave remains the same.

What physical change occurs when source of sound waves is at rest and the listener moves?

Statement-1: The change in pitch of sound depends on speed of source and detector relative to each other and not on the distance between them. Statement-2: The pitch of sound depends on intensity of sound which is independent of distance between source and detector.

In Dopplers effect, when a source moves towards a stationary observer, the apparent increase in frequency is due to

when a source of sound of frequency f crosses stationary observer with a speed v_(s) (lt lt speed of sound v) , the apparent change in frequency Δf is given by