Using Sound

Objects can be detected underwater by using sound waves above 20,000 Hz; ultrasonic.

• True

• False

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

If a wrecked ship sits 1,500 meters beneath the surface of the ocean and sound travels 1,500 meters/second in water 20⁰C, how long will it take, in seconds, for the sound to travel to the surface of the wrecked ship and return to the surface of the ocean?

• 1 second

• 2 seconds

• 10 seconds

• 0.1 seconds

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Humans perceive pitch primarily because of the wave's frequency.

• True

• False

Which of the following is the term that describes the frequency at which a material tends to vibrate when it is disturbed?

• pitch

• sound quality

• resonance

• natural frequency

Which of these instruments would have a resonator?

• Violin

• Guitar

• Kettledrum

• Flute

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

____________ is the use of reflected sound waves determine distances to locate objects.

A _____ device sends a burst of ultrasound waves that travel through the water.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Dogs can hear ultrasound frequencies up to about ______ Hz, well above the upper limit for humans.

• 25,000

• 45,000

• 30,000

• 50,000

Give an example of an animal that uses echolocation to navigate and find food.

Bats use ultrasound waves with frequencies up to ________ Hz, to move around and hunt.

• 150,000

• 10,000

• 100,000

• 110,000

Tags

NGSS.MS-PS4-1