KS3 Questions on Sound
Q8. The diagram below shows part of the human ear.
We can hear somebody speaking because sound waves enter our ears.
(a)
(i) What do our eardrums do when sound waves reach them?
The eardrum vibrates.
1 mark
(ii) Sometimes a lot of wax is produced in the ear. The wax rests against the eardrum, as shown above. Give one reason why we cannot hear very well when our ears contain a lot of wax.
any one from
- it stops some of the sound waves reaching the eardrum
- it absorbs some of the soundwaves
- the eardrum vibrates less
- soundwaves are reflected by the wax
1 mark
(b) The table below shows the lowest and highest frequencies that five living things can hear.
living thing |
lowest frequency (Hz) |
highest frequency (Hz) |
human |
20 |
20 000 |
sparrow |
300 |
20 000 |
dog |
20 |
45 000 |
cat |
20 |
64 000 |
rabbit |
300 |
42 000 |
(i) Which three living things from the table cannot hear a frequency of 43 000 Hz?
Human, sparrow and rabbit.
1 mark
(ii) From the table, choose the living thing that can hear the biggest range of frequencies.
cat
1 mark
maximum 4 marks
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