Uses of Sound (9-C)

The ability that some animals have to "see" with sound is called _______.

• an echo

• echolocation

• acoustics.

Answer explanation

The ability to 'see' with sound is known as echolocation. This technique allows animals like bats and dolphins to navigate and locate objects by emitting sound waves and interpreting the echoes that return.

Scientists can use _______ to help them locate things underwater.

• sonar

• ultrasounds

• acoustics

Answer explanation

Scientists use sonar, which stands for Sound Navigation and Ranging, to locate objects underwater by emitting sound waves and analyzing their echoes. This makes sonar the correct choice for locating things underwater.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Doctors can use _______ to help them see inside a person's body without doing surgery.

• sonar

• an ultrasound

• acoustics

Answer explanation

Doctors can use an ultrasound to visualize internal organs and structures without invasive surgery. Unlike sonar or acoustics, which are not specifically designed for medical imaging, ultrasound is a safe and effective diagnostic tool.

Tags

NGSS.MS-PS4-2

Rough, soft, or fuzzy materials will _______ sound waves.

• reflect

• echo

• absorb

Answer explanation

Rough, soft, or fuzzy materials will absorb sound waves, reducing their intensity. This is why such materials are often used in soundproofing, as they prevent sound from bouncing back.

Tags

NGSS.MS-PS4-2

You would most likely hear echoes in a room with _______ walls.

• smooth

• rough

• fuzzy

Answer explanation

You would most likely hear echoes in a room with smooth walls because they reflect sound waves effectively, creating clear echoes. In contrast, rough or fuzzy walls absorb sound, reducing echo.

Tags

NGSS.MS-PS4-2

A sound wave that bounces back toward its source and is heard again is called an _______.

• echo

• reflection

• reverb

• resonance

Answer explanation

An echo is the reflection of sound that returns to the listener after bouncing off a surface. It is specifically the repeated sound heard again, making 'echo' the correct term for this phenomenon.

Tags

NGSS.MS-PS4-2

The science of sound is known as _______.

• acoustics

• optics

• thermodynamics

• kinematics

Answer explanation

The science of sound is called acoustics. It studies how sound is produced, transmitted, and received. The other options, such as optics and thermodynamics, relate to light and heat, respectively, not sound.

Tags

NGSS.MS-PS4-2

Some people developed theories about sound through the study of _______.

• music

• astronomy

• chemistry

• geography

Answer explanation

The study of music involves understanding sound waves, frequencies, and harmonics, which directly relates to theories about sound. Other fields like astronomy, chemistry, and geography do not focus on sound in the same way.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Smooth, hard materials _______ sound waves.

• reflect

• absorb

• transmit

• refract

Answer explanation

Smooth, hard materials reflect sound waves due to their surface properties, causing the waves to bounce back rather than being absorbed or transmitted. This is why the correct answer is 'reflect'.

Tags

NGSS.MS-PS4-2

A harsh, unwanted, or unexpected sound is often called a _______.

• noise

• melody

• harmony

• tune

Answer explanation

A harsh, unwanted, or unexpected sound is best described as 'noise'. Unlike 'melody', 'harmony', or 'tune', which imply pleasant sounds, 'noise' refers to disruptive or unpleasant auditory experiences.