Waves and Sound

What best describes a possible transfer of energy?

A mechanical wave transfers energy through matter.

Which is the best example of the wave phenomenon called transmission?

A street is seen through a window. Sound is heard around an open doorway. An image of a tree is seen is on the surface of a smooth lake.

Which correctly identifies the parts of a transverse wave?

A: crest B: amplitude C: trough D: wavelength

Ten students stand in a circle and are told to make a transverse wave. What best describes the motion of the students?

One at a time, each student lifts his or her hands up and then down.

Which best explains why sound travels fastest through a solid?

Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.

What best explains the speed of sound in different states of matter?

Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.

Why does a shirt appear white outside on a sunny day?

All the light is reflected, so the shirt appears white.

What is the name of the perceived change in a sound wave's frequency due to motion between the observer and the sound source?

Doppler effect

Which best describes the energy of a sound wave as it travels through a medium?

It decreases.

What best describes the pitch that Juan hears?▫️

The pitch drops to a lower pitch once the ambulance passes by Juan.

A guitar string is plucked. What best describes the formation and transmission of the sound wave?

The string vibrates the surrounding air, which produces a longitudinal wave.

How will sunlight most likely affect a black shirt on a hot summer day?

The temperature of the shirt will increase because all wavelengths of light are absorbed by the shirt.

What is the cause of the beats?

The two waves produced have different speeds. The two waves produced have different wavelengths. The two waves produced have different frequencies.

A sound wave travels through water. What best describes the direction of the water particles?

The water particles move in the same direction as the vibrating source of the sound wave.

How are electromagnetic waves different than all other waves?

They can travel through space.

How are electromagnetic waves different than all other waves?▫️

They can travel through space.

What part of the wave determines how much energy it has?

amplitude period velocity

highest point

crest

What type of wave activity is shown in the image?

diffraction

a soundproof door is almost shut but still leaves a small opening, what wave phenomenon is responsible for someone being able to hear sound from the room while standing by the wall to the side of the opening?

diffraction

What wave phenomenon is responsible for the sunlight shown in this diagram?

diffraction, because light is bent around the clouds

What is transmitted by all waves?

energy

How many wavelengths are seen in this image of a sound wave?

four

What best describes the refraction of light rays?▫️

light bending when it passes through a lens

What best describes a SONAR wave?

longitudinal and electromagnetic

What best describes the waves produced a the tuning fork?

mechanical, because the vibrating tuning fork makes air molecules around it vibrate or move

An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

more than 450 Hz

A longitudinal wave moves energy that is [________________________] to the direction of the wave's movement.

parallel

The [__________________] is the time it takes for a wave to complete one cycle.

period

As the source moves west, which person hears the highest pitch?

person A

A sound wave travels through air. In which regions are air molecules the least dense?

rarefactions

What two factors affect the speed of a sound wave as it travels through a medium?

the type of medium and the temperature of the medium

lowest point of a wave

trough

Which color of light has the greatest frequency?▫️

violet

What factors affect the speed of a wave? Check all that apply. the amplitude of the wave the energy of the wave the temperature of the medium the type of wave the type of medium

🚫◻️✔️✔️◻️✔️ 🚫✔️✔️◻️◻️✔️

What are examples of devices that use electromagnetic waves? Check all that apply.

🚫✔️◻️✔️◻️✔️ 🚫◻️✔️◻️◻️✔️ FM radios, microwaves, TV remote controls, alarm clocks, X-rays

What best describes the difference between the second sound wave and the first?

The air molecules in the compressions of the second wave are more dense.

A band director instructs students to play a pitch louder. How will the sound wave change when the band plays the same pitch louder?

The amplitude of the sound wave will increase.

What is the purpose of a rearview mirror in a car?

The mirror allows the light to be reflected so the objects behind the car can be seen.

Which statements best describe X-rays? Check all that apply.

-X-rays are electromagnetic waves. -X-rays are transverse waves. -X-rays travel at the speed of light.

The straw appears to "bend" because of [_________________].

-refraction