What is sound?

• A type of light

• A solid object

• A form of energy that spreads from its source

• A kind of liquid

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Why does sound need a medium to travel?

• To make it louder

• To propagate through vibrations of particles

• To change its direction

• To increase its speed

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How does sound travel through gases?

• By particles moving in a straight line

• By waves in the ocean

• By particles hitting each other and passing on vibrations

• By particles staying still

Which medium does sound travel fastest through?

• Gases

• Vacuum

• Liquids

• Solids

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Why do you see lightning before hearing thunder?

• Lightning silences the sound

• Thunder is slower than lightning

• Light travels faster than sound

• Sound travels faster than light

Can sound travel in a vacuum?

• Only during the day

• Yes, very fast

• Yes, but very slowly

• No, it cannot

What happens to sound in outer space?

• It becomes light

• It cannot travel

• It echoes

• It travels faster

Why is sound louder when you hear it through a solid medium?

• Because sound travels slower in solids

• Because air absorbs sound

• Because sound vibrations travel faster in solids

• Because the medium amplifies the sound

What is the speed of sound in air?

• Approximately 1000 meters per second

• Approximately 350 meters per second

• Approximately 150 meters per second

• Approximately 500 meters per second

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What demonstrates that sound cannot travel through a vacuum?

• Playing music in space

• A vacuum cleaner running

• A cellphone ringing in a vacuum-sealed jar

• Shouting in a vacuum