Chapter 11: Sound
SOLUTION OF SELF-ASSESSMENT QUESTIONS
11.1 Sound Waves
Q1. Why pressure is greater at the compression region of longitudinal waves.
In the compression region, the medium particles come close together which causes a rise in pressure.
That is why pressure is greater at the compression region than at the rarefaction region of longitudinal waves.
Q2. Why can we not hear the explosive sound produced by the Sun?
We cannot hear the explosive sound produced by the sun because sound waves are mechanical waves, and a material medium is required for their propagation whereas there is no medium between the sun and the earth.
Q3: Can sound travel through solids and liquids?
Yes, sound can travel through solids and liquids because sound waves are mechanical waves, and for propagation, they require a material medium whether it is gas, liquid, or solid.
11.2 Speed of Sound
Q1: Can any object produce a sound without any vibrations in it?
Sound waves are produced by a body vibrating in a medium, therefore without any vibration, no sound waves can be produced.
Q2: How can the pressure affect the speed of the sound in the air?
The speed of sound waves in the air cannot be affected by pressure.
Q3: A sound wave traveling in solid passes into the air. What will happen to the speed of a sound wave when it enters the air? Explain.
The speed of sound waves is higher in solids than in gases.
Therefore, as the sound waves traveling in a solid pass into the air, their speed decreases.
11.3 Seeing Sound
Q1: What characteristic determines the quality of the sound?
Waveforms of sound determine its quality. The waveform is the resultant effect of fundamental frequency and overtones produced by a sound source.
Q2: If two sounds from different sources have the same frequency and loudness. Can you distinguish the Sound?
We can distinguish two sounds from different sources having the same frequency and loudness due to the quality of these sounds.
11.4 Noise Pollution
Q1: What types of sounds have pleasant effects on our hearing sensations?
Musical sounds have pleasant effects on our hearing sensations.
Q2: How can we reduce noise pollution?
Noise pollution can be reduced to an acceptable level by:
- Replacing noisy machinery with environment-friendly machinery and equipment.
- Placing sound-reduction barriers.
- Using hearing protection devices, etc.
11.5 Ultrasound
Q1: Which one has a higher speed sound or light?
The speed of light is much higher than that of sound.
Q2: Is it possible to produce an echo in a room of length 10m?
To produce an echo the minimum distance between the sound source and the obstacle should be 17m.
Chapter 11: Sound
MCQs | Notes | Numerical | Self Assessment Questions
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