Light and Sound Review

Which statement best describes how humans hear sound?

• Sound waves enter the ear canal and increase in amplitude, which causes you to hear the sound.

• Sound waves cause parts of the ear to vibrate until the waves are converted to electrical signals, which are sent to the brain.

• Sound waves travel into people ears, then the eardrum sends the sound waves to the brain.

• Sound waves become sounds when they strike the eardrum inside the ear.

When Consuelo struck a tuning fork and held it close to a string on a guitar, the string began to vibrate on its own and make a sound. Which statement best explains why the string vibrated without anyone touching it?

• The string vibrated because of destructive inference between its sound waves and those of the tuning fork.

• The tuning fork produced ultrasonic frequencies beyond human hearing.

• The tuning fork and the guitar string both created mechanical waves.

• The string vibrated because of resonance, which happened because the tuning fork and guitar string have the same natural frequency.

Which material best absorbs sound waves in a room?

• heavy curtains

• hardwood floors

• brick walls

• cement floors

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NGSS.MS-PS4-2

Which of the following is not a way in which echolocation is used?

• flying bats avoiding trees and houses at night

• sending messages over telephone lines

• dolphins finding fish in deep water

• mapping the ocean floor

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NGSS.MS-PS4-2

Josh observed a bolt of lightning during a thunderstorm. It took more than 15 seconds for Josh to hear the sound of thunder. Why did Josh see the lightning strike before he heard the thunder?

• Thunder always takes 15 seconds to travel through the air after lightning strikes.

• Light waves from the lightning and sound waves from the thunder moved through different media.

• Light waves are electromagnetic waves that travel much faster than mechanical waves, such as the sound waves he heard as thunder.

• The conditions in the air at the time allowed light waves to move faster than the sound waves he heard as thunder.

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NGSS.MS-PS4-1

A large explosion can damage a person’s hearing. What causes this damage?

• Heat from the explosion burns the eardrum.

• The explosion triggers smaller explosions inside the ear

• Transverse waves from the explosion cause vibrations that damage the ear.

• Compression waves from the explosion cause vibrations that damage the ear.

When sound waves move through a medium, in what direction do the particles in the medium move?

• The particles always move side to side.

• The particles always move up and down.

• The particles always move in the same direction as the wave

• The particles always move perpendicular to the direction of the wave.

What role does the inner ear play in hearing sounds?

• It blocks out unwanted sounds.

• It converts vibrations into electrical signals.

• It helps determine if a sound is in front of or behind you.

• It reflects high and low frequencies back to their source.

What property of a wave changes to create the Doppler effect?

• speed

• medium

• amplitude

• frequency

A car with loud bass speakers drives by a house. The windows of the house vibrate significantly. What term best describes why the windows vibrate?

• interference

• resonance

• reflection

• echoing

Tags

NGSS.MS-PS4-2