Sound waves travel through the vibration of molecules in a medium such as air, water, or solids. These vibrations are passed along from molecule to molecule, allowing the sound to move through the medium.
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MCQs
1. Which of the following can sound waves travel through?
A) Space
B) Water
C) A vacuum
D) Invisible barriers
Answer: B) Water
Explanation: Sound waves can travel through water because it is a medium. They cannot travel through a vacuum, like outer space.
2. What happens to sound waves when they travel through air?
A) They speed up
B) They disappear
C) They move in a straight line
D) They spread out in all directions
Answer: D) They spread out in all directions
Explanation: Sound waves propagate by vibrating air molecules, spreading out in all directions from the source.
3. Which of the following statements is true about how sound travels?
A) Sound travels faster in air than in water.
B) Sound travels faster in solids than in air.
C) Sound cannot travel through solids.
D) Sound travels at the same speed in all materials.
Answer: B) Sound travels faster in solids than in air.
Explanation: Sound waves travel faster in solids because the molecules are closer together, making it easier for the sound wave to pass through.
4. How can you hear the sound around corners but not see light?
A) Sound waves can bend, but light waves cannot.
B) Sound waves are faster.
C) Sound waves are smaller.
D) Light waves can bend, but sound waves cannot.
Answer: A) Sound waves can bend, but light waves cannot.
Explanation: Sound waves can diffract, or bend around obstacles, allowing them to be heard even if the source is not directly visible. Light waves do not bend this way in everyday situations.
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