Diagnostic Test: Sound

How do musical instruments make sounds when we play them?

• By reflecting light waves.

• By vibrating and creating sound waves.

• By producing heat energy.

• By breaking into smaller parts.

When you shout in a playground, why can your friends hear you from far away?

• Because air is a good conductor of electricity.

• Because air molecules can vibrate and transmit sound waves.

• Because air absorbs sound waves.

• Because air is a solid medium.

When you blow into a whistle, the sound can be high or low. Which of the following best describes how the sound's highness or lowness (pitch) is related to how fast the air moves (frequency)?

• Faster air movement results in lower pitch.

• Slower air movement results in higher pitch.

• Pitch and air movement are unrelated.

• Faster air movement results in higher pitch.

What happens to sound waves when they hit a wall while you are playing music?

• They are reflected, absorbed, or transmitted.

• They disappear completely.

• They change into light waves.

• They travel faster.

When you clap your hands, you can hear the sound it makes. But why can't we hear any sound from the Sun, even though it is very powerful and makes energy?

• The Sun does not produce sound at all.

• The sound from the Sun is too quiet to reach Earth.

• There is no medium like air in space to carry sound waves.

• Earth's atmosphere blocks the Sun's sound waves.

When you shout in a big empty room, why do you hear your voice come back to you?

• Sound waves are absorbed by surfaces.

• Sound waves are reflected off surfaces and return to our ears.

• Sound waves travel in a straight line without interruption.

• Echoes are caused by changes in air pressure.

When you listen to music, what range of sounds can your ears hear?

• 1 Hz to 100 Hz

• 20 Hz to 20,000 Hz

• 50 Hz to 50,000 Hz

• 10 Hz to 10,000 Hz

When you go to the doctor and they use a special machine to look inside your body, what type of sound wave are they using that is too high for you to hear?

• Infrasound

• Ultrasound

• Sonic waves

• Radio waves

Why does sound travel faster in solids than in gases?

• Solids are heavier than gases

• Sound cannot travel in gases

• Particles in solids are closer together

• Solids absorb less sound energy

What is the term for the bouncing back of sound waves?

• Refraction

• Diffraction

• Echo

• Absorption