Sound — Important Questions
Madhya Pradesh Board · Class 9 · Science
29 important questions from Sound for Madhya Pradesh Board Class 9 Science, with answers. Part of the Madhya Pradesh Board Class 9 Science syllabus.
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Important Questions from Sound
Which of the following are examples of longitudinal waves?
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Sound waves in air, Sound waves in water, Sound waves in solids
Sound waves are longitudinal waves where particles oscillate parallel to the direction of wave propagation. This occurs in all media - solids, liquids, and gases. Light waves and surface water waves are transverse waves.
Sound cannot travel through vacuum.
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True
Sound requires a medium (solid, liquid, or gas) to travel. It cannot propagate through vacuum because there are no particles to carry the vibrations. This is why there is no sound in space.
Which factors affect the speed of sound?
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Nature of the medium, Temperature of the medium, Density of the medium
Speed of sound depends on the nature, temperature, and density of the medium. It travels fastest in solids, slower in liquids, and slowest in gases. Higher temperature increases speed. Frequency and amplitude do not affect the speed of sound.
Compressions in a sound wave are regions of:
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High pressure and high density
Compressions are regions where particles are crowded together, resulting in high pressure and high density. Rarefactions are regions of low pressure and low density where particles are spread apart.
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