Sound waves

What type of wave is sound?

• transverse

• longitudinal

• electromagnetic

Through which of the following can sound not travel?

• air

• vacuum

• water

What is the approximate speed of sound in air?

• 330 m/s

• 1500 m/s

• 5000 m/s

Which of the following best describes a sound wave with high amplitude?

• The sound wave is loud

• The sound wave is high pitched

• The sound wave is above the cloud

What is the range of normal human hearing?

• 2 Hz to 2000 Hz

• 20 Hz to 2000 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

A sonar system on a boat sends an ultrasound pulse towards the seabed. The pulse is reflected, and it is detected 0.2 s later by the system. Calculate the depth of water if the speed of sound in water is 1 480 m/s.

• 148 m

• 296 m

• 14 800 m

A carpet salesperson uses an ultrasonic device to measure the length of a room. The device shows that the distance from one wall to the opposite wall is 6.5 m. If the speed of ultrasound in air is 340 m/s, how long does it take for the ultrasound to travel to the far wall and back again?

• 0.019 s

• 0.038 s

• 4420 s

What is the name for an area of low pressure in a longitudinal wave?

• compression

• rarefaction

• equilibrium

What does the area pointed by the arrow in the diagram represent?

• compression

• rarefaction

• equilibrium