8th_Final Review

Students are modeling waves by shang a rope up and down. We know this is a wave because --

• the rope is made up of strands of cotton threads which are braided together.

• the student can change the distance the rope moves by moving the rop further up or down.

• it has a repeating pattern with a specific wavelength, frequency, and amplitude.

• the rope stops moving when the students stop shaking it up and down.

Tags

NGSS.MS-PS4-1

Which of the waves is carring the greatest amount of energy?

• 
• 
• 
• 

Tags

NGSS.MS-PS4-1

The waves that carry the most energy are the waves that--

• move into a new medium.

• are closest together.

• move the most slowly.

• have the greatest amplitude.

Tags

NGSS.MS-PS4-1

Which of the following waves has the highest frequency?

• 
• 
• 
• 

Tags

NGSS.MS-PS4-1

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

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

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

• Water in a glass vibrating because of the sound of thunder

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

Tags

NGSS.MS-PS4-2

Automobile engineers create quieter cars and trucks by designing acoustic glass that does all of the following EXCEPT--

• absorbs sounds.

• amplifies sounds.

• diffuses sounds.

• reflects 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 ca no longer be heard. Which of the following best explains why the students can no longer hear the bell?

• Removing the air from the jar allows the bell to ring only very softly.

• The difference in pressure inside and outside the glass jar is too great.

• 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.

Tags

NGSS.MS-PS4-2

Geologists can learn about rock layers beneath the surface of Earth using sound waves. They use a vibration 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 require energy, such as electricity to generate them.

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

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

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

Tags

NGSS.MS-PS4-2

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 creat walls that--

• absorb sounds and prevent them from passing through.

• allow sounds to move easily from one place to another.

• allow communication between people inside and outside the room.

• reflect sounds around the room and alter their properties.

Tags

NGSS.MS-PS4-2

A student places a pencil in a glass of water and observes that the pencil appears to be broken. Which of these proides the best explanation for why the pencil appears broken?

• Water reflects light rays away from the pencil.

• The surface of the water reflects light rays.

• The pencil absorbs all the light rays that hit it.

• Light rays are bent by the water in the glass.

Tags

NGSS.MS-PS4-2