Sound waves are longitudinal waves that must pass through a medium, such as air. Echoes are reflections of sounds. The frequency of ultrasound is above 20 kHz. Ultrasound is useful for cleaning.
Which waves are fastest?
Light
Sound
Water
What type of waves are sound waves?
Longitudinal
Transverse
What part of the ear collects sounds?
Ear drum
Ear canal
Pinna
What is the diaphragm in a telephone most like?
Ossicles
What is the amplitude of a wave?
The distance between the same two points on a wave
The maximum height of the wave
The number of waves per second
What is the wavelength of a wave?
What is the frequency of a wave?
In which does sound travel fastest?
Liquids
Solids
Gases
Above what frequency is ultrasound?
10 000 Hz
20 Hz
20 000 Hz
What do we use ultrasound for?
Taking photos of unborn babies
Taking photos of jewellery
Cleaning babies