Sound

What type of wave is sound?

• Longitudinal

• Electromagnetic

• Transverse

Through which of the following can sound not travel?

• Air

• A vacuum

• Solids

What is the approximate speed of sound in air?

• 330 m/s

• 1,500 m/s

• 300 million m/s

What is an area of low pressure in a wave called?

• Compression

• Equilibrium

• Rarefaction

What is the range of normal human hearing?

• 2 Hz to 2,000 Hz

• 20 Hz to 2,000 Hz

• 20 Hz to 20,000 Hz

What is ultrasound?

• Sound waves above the range of human hearing

• Sound waves within the range of human hearing

• Sound waves below the range of human hearing

Which of these is not a use of ultrasound?

• Internal body scans

• Measuring the size of earthquakes

• Cleaning jewellery

Which method is used to detect objects underwater?

• Ultrasound scans

• Echo sounding

• Seismic waves