Sound Propagation
Physics ⇒ Waves and Sound
Sound Propagation starts at 7 and continues till grade 12.
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See sample questions for grade 12
Describe the effect of humidity on the speed of sound in air.
Describe what happens to the speed of sound as the density of a gas increases, assuming elasticity remains constant.
Explain why sound cannot be heard on the Moon.
Explain why sound is not heard instantly when a distant explosion occurs.
Explain why sound travels faster in solids than in gases.
A person hears thunder 5 seconds after seeing lightning. If the speed of sound in air is 340 m/s, how far away is the lightning?
A submarine uses sonar to detect an object underwater. The sound pulse returns after 4 seconds. If the speed of sound in water is 1500 m/s, how far is the object from the submarine?
Explain why sound is not heard instantly when a distant explosion occurs.
Sound travels fastest in which of the following?
(1) Air
(2) Water
(3) Steel
(4) Vacuum
Sound waves cannot travel through which of the following?
(1) Air
(2) Water
(3) Steel
(4) Vacuum
Which of the following best explains why sound cannot travel in space?
(1) Space is too cold
(2) There is no medium in space
(3) Sound is absorbed by stars
(4) Sound is too weak in space
Which of the following is necessary for the propagation of sound?
(1) Vacuum
(2) Medium
(3) Light
(4) Heat
If the temperature of air increases, the speed of sound in air will (increase/decrease/remain the same).
Sound waves are ______ waves because the particles of the medium vibrate parallel to the direction of wave propagation.
The speed of sound in air at 0°C is approximately ______ m/s.
The speed of sound in air at 20°C is approximately ______ m/s.
True or False: Sound can travel through a vacuum.
True or False: The amplitude of a sound wave affects its speed of propagation.
True or False: The frequency of a sound wave changes as it moves from air to water.
True or False: The speed of sound in water is greater than in air.
