Study of Sound — Important Questions
Maharashtra Board · Class 9 · Science
45 important questions from Study of Sound for Maharashtra Board Class 9 Science, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Study of Sound
Which mediums can sound travel through?
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Solids, Liquids, Gases
Sound requires a material medium to travel. It can propagate through solids, liquids, and gases but cannot travel through vacuum as there are no particles to vibrate.
Which factors affect the velocity of sound in gases?
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Temperature, Density, Molecular weight
Sound velocity in gases depends on temperature (directly), density (inversely), and molecular weight (inversely). Color and pressure at constant temperature don't affect it.
Infrasound has frequency:
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Below 20 Hz
Infrasound refers to sound waves with frequencies below 20 Hz, which are below the human audible range.
An echo is heard when sound is:
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Reflected
An echo is produced when sound waves are reflected from a surface back to the listener, creating a repetition of the original sound.
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