Sound Wave Interactions

Which of the following provides an example of sound waves being reflected?

• A noise that produces an echo when it bounces off a distant wall

• The sound of a distant train getting louder as it approaches an observer

• The sound of a boat motor.

• Hearing music being played by a neighbor's stereo through a wall

Tags

NGSS.MS-PS4-2

Automobile engineers create quieter cars and trucks by designing acoustic glass that–

• absorbs sounds.

• reflects sounds.

• stops sounds.

• amplifies sounds.

Tags

NGSS.MS-PS4-2

A ringing bell makes noise inside a glass jar. Then the air is removed from the glass jar using a vacuum pump. When all of the air leaves the jar, the sound of the ringing bell can no longer be heard. Which of the following best explains why the students can no longer hear the bell?

• The air in the jar provides a medium for the sound to travel through.

• The sound in the empty jar is reflected off the inside of the glass sides.

• The sound runs out of energy.

• The sound has no wavelength.

Tags

NGSS.MS-PS4-2

Geologists can learn about rock layers beneath the surface of Earth using sound waves. They use a vibration truck to send sound waves into the ground. A measuring truck has special microphones, called geophones, that pick up sounds. This method for learning about rock layers depends on what characteristic of sound waves?

• Sound waves can travel through and reflect off rock layers.

• Sound waves require energy, such as electricity to generate them.

• Sound waves can travel for an unlimited distance from the source that creates them.

• Sound waves are absorbed by dense solids and reflect off liquids.

Music studios use “soundproof" recording rooms. The walls of these rooms are designed in such a way that the only sounds that reach the microphones inside the room are sounds from inside the room. The most important characteristic in designing the soundproof room is to create walls that–

• allow communication between people inside and outside the room.

• reflect sounds around the room to alter their properties.

• allow sounds to move easily from one place to another

• absorb sounds and prevent them from passing through.

Tags

NGSS.MS-PS4-2

As frequency of a wave increases, the wavelength decreases.

• true

• false

Which do sound waves travel faster through?

• water

• rock

• air

• carbon dioxide gas

Tags

NGSS.MS-PS4-2

Sound waves travel faster through cold air than warm air.

• true

• false

What type of wave is this?

• longitudinal wave

• transverse wave

• grand wave

• yellowstone wave

Tags

NGSS.MS-PS4-1

In air, sound waves travel faster in

• low altitude

• high altitdue

• the speed of sound is always the same.

Tags

NGSS.MS-PS4-1