KS3 Questions on Sound

Q2. Lee blew across the top of paper tubes to make sounds. He investigated how changing the length of a tube affects the pitch of the sound.

(a) What instrument could he use to measure the length of the tubes?

A metre rule

1 mark

(b) The photograph below shows the different lengths of tubes Lee used. Suggest one way his test might not have been fair.

any one from

  • tubes had different widths ( bores)
  • he blew in different ways
  • different thickness /type of paper

do not accept 'different lengths' - that was the idea of the experiment!

1 mark

(c) Lee made a prediction. Which of these statements is a prediction?

A
The tubes were made of paper.
B
The pitch of the sound is how high or low it is.
C
The longer tube will make a lower sound.
D
The sound is caused by the vibration of air.

1 mark

(d) Lee blew across the ends of 3 different lengths of tube and compared the pitch of the sound produced. His results are shown below.

Length of tube/cm
Pitch of the sound
5
high
25
medium
50
low

 

Which length of tube made the sound with the highest pitch?

5 cm

1 mark

Maximum 4 marks