Quick Quiz 8L Sound and hearing

Sound is caused by:

• waves

• vibrations

• heat

• air

The threshold of hearing is:

• the quietest sound we can hear.

• the loudest sound we can hear.

• a sound equal to a loudness of 10 dB.

• the sound at which the eardrum breaks.

Elephants can make sounds of high intensity. These sounds will be:

• quiet

• high

• soft

• loud

A loud sound is produced by waves with:

• a high pitch.

• a high frequency.

• a large amplitude.

• a small amplitude.

Which statement is not true?

• Light and sound can both be used to send information.

• Sound travels at the same speed as light.

• Light travels faster than sound.

• Some animals use light and sound to communicate.

The ear changes sound energy into:

• light energy.

• electrical energy.

• noise energy.

• heat energy.

Which of the following statements is true?

• An echo is caused when sound waves are absorbed by a material.

• An echo is caused when sound waves are reflected.

• Materials that are good reflectors of sound are called sound insulators.

• Materials that are good at absorbing sound are called insulators.

The tweeting sound made by a small bird has a pitch that is:

• soft

• high

• low

• quiet

Frequency:

• is the height of the waves.

• is the number of waves passing a point each second.

• is measured in metres.

• affects how loud a sound is.

Starting with the slowest, which of the following is the correct order for the speeds of sound travelling through materials?

• solid, gas, liquid

• gas, vacuum, liquid, solid

• solid, gas, vacuum

• gas, liquid, solid