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2. How do human beings produce sound? Draw a well-labelled diagram showing the
larynx
3. State four ill effects caused by noise pollution.cue as
4. Explain why sound can travel through a solid, liquid and gas, but not through a vacuu
5. Draw a well-labelled figure of human ear.
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Answer Briefly
1. Name the property which decides whether a given sound is audible or inaudible.
2. How can you distinguish between different sounds?
3. What are the various sources of noise pollution?
4. How do loudness and pitch of sound depend on amplitude and frequency respectively
Answer in One Word or a Few Words
tate whether the following statements are True (T) or False (F).
1. Sound travels faster through air than through water.
Sound can be produced by beating an object irrespective of whether vibrations are
produced or not.
The number of oscillations per second of a vibrating object is called its time period.
Noise pollution may cause partial hearing
Answers
1. The vocal folds produce sound when they come together and then vibrate as air passes through them during exhalation of air from the lungs. This vibration produces the sound wave for your voice. In order for the sound to be clear and not raspy or hoarse, the vocal folds must vibrate together symmetrically and regularly.
2. The vocal folds produce sound when they come together and then vibrate as air passes through them during exhalation of air from the lungs. This vibration produces the sound wave for your voice. In order for the sound to be clear and not raspy or hoarse, the vocal folds must vibrate together symmetrically and regularly.
3. Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
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