Unit 3 Test Review

Category 1

100

T/F A human can hear at a frequency of 10 Hz.

F

200

Which statement is true of a mechanical wave?

• It can travel in a vacuum.
• It must have a medium.
• It must travel in empty space.
• Both sound and light are examples.

It must have a medium

300

What is the resulting direction of a surface wave?

Circular

400

Which type of wave has a wave perpendicular to the disturbance?

Transverse

500

What is the speed of a wave if the wavelength is 100 m and the period is 20 s?

• 2,000 m/s
• 120 m/s
• 80 m/s
• 5 m/s

 

5 m/s

Category 2

100

Unlike a transverse wave, what is true about the disturbance in a longitudinal wave?

• It is parallel to the wave motion.

• It is perpendicular to the wave motion.

• It is in the opposite direction of the wave motion.

• It is in a circular motion.

It is parallel to wave motion

200

Why does a siren have a lower pitch as it moves away?

• The troughs of the sound wave are spaced closer together.
• The amplitude of the sound wave is increased.
• The period of the sound wave is decreased.
• The crests of the sound wave are farther apart.

The crests of the sound wave are farther apart.

300

When traveling from a solid to air, what would a sound wave be expected to do? 

• speed up
• slow down
• stay the same speed
• fluctuate speed

slow down

400

Which type of wave cannot travel in a vacuum?

Sound wave

500

If the number of troughs that pass a point in a given time increases, what has increased?

frequency 

Category 3

100

T/F Dolphins and Dogs can hear at a frequency above 20,000 Hz.

T

200

Which statement is true about surface waves?

• The disturbance is only parallel to the motion of the wave.
• The disturbance is only perpendicular to the motion of the wave.
• The disturbance is in a circular motion.
• The disturbance does not have a specific motion.

The disturbance is in a circular motion

300

What is the Doppler effect used to do in hospitals? 

• measure temperature
• monitor blood pressure
• monitor blood flow
• monitor oxygen levels

Monitor Blood flow

400

Why does a siren have a higher pitch as it approaches you?

• The crests of the sound wave are spaced closer together.
• The amplitude of the sound wave is increased.
• The period of the sound wave is increased.
• The troughs of the sound wave are farther apart.

The crests of the sound wave are spaced closer together.

500

If the number of crests that pass a point in a given time increases, what has decreased?

wavelength

Category 4

100

T/F surface waves have shorter amplitudes and longer wavelength.

F. Longer amplitudes and longer wavelength

200

Unlike a longitudinal wave, what is true about the disturbance in a transverse wave?

• It is parallel to the wave motion.

• It is perpendicular to the wave motion.

• It is in the opposite direction of the wave motion.

• It is in a circular motion.

It is perpendicular to the wave motion

300

When traveling from air to a solid, what would you expect a sound wave to do?

• speed up
• slow down
• stay the same speed
• fluctuate speed

Speed up

400

Which statement is true about a surface wave?

• It only has properties of transverse waves.
• It only has properties of longitudinal waves.
• It has properties of both transverse and longitudinal waves.
• It does not have properties of either transverse or longitudinal waves.

It has properties of both transverse and longitudinal waves

500

There are two main types of mechanical waves, what are they? 

Transverse and longitudinal

Category 5

100

T/F Trough is the highest part of a wave with the highest magnitude of a wave?

F

200

Define Frequency.

a measure of how many wavelengths pass a given point per second

300

The relationship between frequency and wave speed is found which the equation?

v=f (LAMBDA) 

OR

wave speed= frequency * wavelength

400

What is the Doppler effect used to measure at baseball games? 

• speed
• temperature
• weather
• moving clouds

Speed

500

Heat moves in three ways. Name all three

radiation, convection, and conduction.