Waves

The lowest point of a wave is its

• trough

• breaker

• swell

• crest

The distance between a wave's crest and its trough is known as its

• low tide measurement

• water depth

• wave height

• wave length

The leaves on a tree appear to be green because the molecules of the leaves

• emit only green light

• absorb only green light

• absorb all colors except green

• reflect the light back unchanged

For Kathy to see the image, light must have entered her eyes. What specifically entered Kathy's eyes?

• only matter

• only energy

• both matter and energy

• neither matter nor energy

If a light ray hits the back of the spoon at a 30° angle, the angle that the ray will reflect off the spoon is

• less than 30 degrees

• 30 degrees

• more than 30 degrees

• unpredictable

The speed of a sound wave depends MOSTLY on

• amplitude

• frequency

• the angle at which it approaches the listener.

• the medium through which the wave travels.

The waves in the pool where you are floating have a crest height of about 1 foot. Bobby does a cannonball dive off the side of the pool and sends waves 4 feet high toward your raft. The waves that Bobby produced have a greater

• amplitude

• compression

• frequency

• wavelength

You can observe the color of your friends shirt with your eyes because

• A)the shirt produces light waves.

• B)the shirt releases light waves.

• C)light is reflected off of the shirt.

• D)light is transmitted from the shirt.

You and your father inspect an empty house with the hopes of buying it.You walk through the rooms talking to one another, and you notice that your voices and footsteps are echoing in the big, empty house. What causes the echo?

• A)sound waves moving slowly through air

• B)sound waves moving around the large rooms

• C)sound waves refracting around corners in the empty rooms

• D)sound waves reflecting off smooth, flat surfaces throughout the house

Imagine a ringing bell set inside a sealed glass jar. Once all the air is removed and a vacuum is created, the ringing sound is no longer heard.Explain why this happens.

• A)The glass prevents any sound from escaping.

• B)The lack of air in the jar causes the ringing to stop.

• C)Without air, the sound waves cannot travel to the ear.

• D)The pressure of the outside air causes the sound to remain within the jar.