Waves and Sound Test Review

A loudspeaker is turned on and plays a constant low-frequency note.

Which of the following statements best describes the motion of the dust particle after the speaker is turned on?

• A transverse wave will disturb the dust particle, moving it parallel to the wave motion.

• A longitudinal wave will disturb the dust particle, moving it parallel to the wave motion.

• A longitudinal wave will disturb the dust particle, moving it perpendicular to the wave motion.

A trumpet creates a sound wave that has a wave speed of 560 m/s and a wavelength of 2 m. What is the frequency of the sound wave?

• 280 Hz

• 1120 Hz

• 0.0036 Hz

Tags

NGSS.HS-PS4-1

What happens to the wavelength as the frequency of a wave increases?

• It is longer

• It is shorter

• It stays the same

Tags

NGSS.HS-PS4-1

Which medium would sound travel the slowest through?

• Solid Wooden Table

• Swimming Pool Water

• Air

• Space

You are in a lab and need to calculate the speed of sound. What do you do?

• Use 340 m/s... close enough.

• Measure the distance over time.

• Use v = 331 + 0.6T

A particular tuning fork vibrates at 117 Hz. Assuming the speed of this sound to be 343 m/s, what is the wavelength produced by the tuning fork?

• 0.34 m

• 40131 m

• 2.9 m

Tags

NGSS.HS-PS4-1

A student plays her trumpet outside during band practice, hitting a 170 Hz bass note. The outside air temperature is 34 degrees Celsius. What is the speed of sound that day?

• 170 m/s

• 351 m/s

• 341 m/s

Tags

NGSS.HS-PS4-1

Which frequency has the longest wavelength?

• 690 Hz

• 871 Hz

• 542 Hz

• 437 Hz

Tags

NGSS.HS-PS4-1

Four students are sitting at a train crossing listening to the horn of a train as it approaches the crossing, continues past, and proceeds away from the crossing. Which of the students best explains the changing sounds in terms of the Doppler Effect?

• Student A says the frequency of the sound is increased in front of the approaching train, making the pitch higher, then the frequency of the sound is decreased behind the train as it moves away, making the pitch lower.

• Student B says the frequency of the sound is decreased in front of the approaching train, making the pitch higher, then the frequency of the sound is increased behind the train as it moves away, making the pitch lower.

• Student C says the speed of the sound is increased in front of the train, making the pitch higher, then the speed of the sound is decreased behind the train, making the pitch lower.

• Student D says the amplitude of the sound is increased in front of the train, making the pitch higher, then the amplitude of the sound is decreased behind the train, making the pitch lower.

Tags

NGSS.HS-PS4-1

Using the image, which observer would detect a higher pitch as the car drives to the right?

• A person in front of the car

• A person behind the car

• The person in the car

• A person on top of the car

Tags

NGSS.HS-PS4-1

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