Chapter 15 Sound

Which BEST describes this sound?

• Starts low pitch and quiet and gets higher pitch and loud

• Starts high pitch and quiet and get lower pitch and loud

• Starts low pitch and loud and gets higher pitch and quiet

• Starts low pitch and quiet and gets higher pitch

Tags

NGSS.MS-PS4-1

In which of the following mediums does sound travel the fastest?

• A) Air

• B) Water

• C) Steel

• D) Vacuum

Tags

NGSS.MS-PS4-2

A student claps their hands near a wall and hears the echo 0.5 seconds later. If the distance to the wall is 170 meters, what is the speed of sound in the air?

• 340 m/s

• 170 m/s

• 85 m/s

• 680 m/s

Tags

NGSS.MS-PS4-2

The number of complete soundwaves in one second is known as:

• A) Amplitude

• B) Wavelength

• C) Frequency

• D) Hertz

Tags

NGSS.HS-PS4-1

What is the unit of measurement for frequency?

• A) Watts

• B) Meters per second (m/s) C)

• Hertz (Hz)

• D) Decibels (dB)

Which of the following sounds is most likely to fall within the human hearing range?

• Dog whistle at 25,000 Hz

• Elephant call at 15 Hz

• Bat echolocation at 180,000 Hz

• A car engine at 80 Hz

If a sound has a frequency of 25,000 Hz, can the average human hear it?

• Yes, easily

• Yes, but only with difficulty

• No, it is above the human hearing range

• No, it is below the human hearing range

Ultrasound is commonly used in medical imaging to visualize internal organs. What property of ultrasound waves makes them suitable for this purpose?

• Ultrasound waves have a high amplitude.

• Ultrasound waves have a very high frequency.

• Ultrasound waves travel at the speed of light.

• Ultrasound waves are audible to the human ear.

Tags

NGSS.MS-PS4-2

In medical ultrasonography, the speed of sound in human tissues is approximately 1540 meters per second. If an ultrasound pulse takes 0.02 seconds to travel to a tissue and back to the transducer, how deep is the tissue being imaged?

• 15.4 meters

• 30.8 meters

• 77 meters

• 154 meters

Tags

NGSS.MS-PS4-2

Marine sonar is used to measure the depth of the ocean floor and detect underwater objects. If a sonar device sends out an ultrasound pulse that takes 4 seconds to bounce off an object on the ocean floor and return to the sonar, and the speed of sound in seawater is approximately 1500 meters per second, what is the depth of the ocean floor at that location?

• 3 km

• 6 km

• 2 km

• 8 km

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2