Ultrasound and Infrasound

• Science
• Lower Secondary (Key Stage 3)

Ultrasound and Infrasound

Label the diagram.

Crest

Amplitude

Wavelength

Trough

Match the keywords to the definitions.

The number of waves per second.

The distance between the same point on neighbouring waves.

The distance between the middle of the wave and the top or bottom.

Frequency

Amplitude

Wavelength

What is the unit of loudness?

1. Decibels (Db)
2. Hertz (Hz)
3. Meters per second (m/s)
4. Amps (A)

What is the unit of frequency?

1. Decibels (Db)
2. Hertz (Hz)
3. Meters per second (m/s)
4. Amps (A)

Which wave is louder?

1. Top
2. Bottom

Which wave is higher pitched?

1. Top
2. Bottom

Loudness (loud to quiet)

Pitch (high to low)

A

A

B

B

C

C

D

D

Name an animal which can hear lower frequency sounds than humans.

Name an animal which can hear higher frequency sounds than humans.

State a frequency of noise that a dog can hear but a mouse cannot.

State a frequency of noise that a mouse can hear but a dog cannot.

Dog whistles have a frequency range of 22,000 to 45,000 Hz. Why can a dog hear it but no one else can?

Why do we use ultrasound instead of x-rays to see a foetus inside the mother's uterus?