Pop Quiz

Above what frequency is ultrasound?

• 2000 Hz

• 20000 Hz

• 20 Hz

• 20 dB

What is the frequency of the given wave?

• 0.25 Hz

• 4 Hz

• 0.2 Hz

• 0.5 Hz

Check all the correct statements.

Ultrasound is used:

• for taking photos of jewellery

• in mapping the sea

• for making imagine of foetuses

• by elephant for communicate

Which part of the ear collects sounds?

• Pinna

• Ear drum

• Auditory nerve

• Ear canal

In which does sound travel fastest?

• Gases

• Solids

• Vacuum

• Liquids

Check all the correct statements below.

• Wavelength is inversely proportional to frequency.

• As frequency increases pitch decreases.

• Loudness of a sound is solely dependent on its amplitude.

• Wavelength is directly proportional to frequency.

What type of wave are sound waves?

• Longitudinal

• Transverse

• Electromagnetic

• Water

What is the time period of the given wave?

• 0.25 s

• 4 s

• 0.4 s

• 0.5 s

What is the wavelength of a wave?

• The maximum height of the wave

• The number of waves per second

• The distances between a crest and a trough

• The distance between the same two points on a wave

What is the amplitude of a wave?

• The number of waves per second

• The maximum height of the wave

• The distance from a crest to a trough

• The distance between the same two points on a wave