KS3 Questions on Sound
Q7. On 7th September 2001, at 11.00 am, over a million pupils took part in a national investigation. They all jumped up and down at exactly the same time. Sensors were used to measure the vibrations caused by the jump. Before they jumped, four pupils described some effects they might notice.
(a) What type of statement did the pupils make?
A |
conclusions |
B |
methods |
C |
observations |
D |
predictions  |
1 mark
(b) Sensors at different places recorded the vibrations of the ground. Why was it important that all the pupils jumped together?
To make the effect as large as possible.
1 mark
(c) The sensor recordings below show the amount of vibration of the ground at three different places during the jump.
Sensor A |
near where pupils jumped |
 |
Sensor B |
at another place near where pupils jumped |
 |
Sensor C |
at a place far away from where pupils jumped |
 |
Carol said, 'When pupils jump, only the ground nearby will vibrate'.
(i) Describe how the evidence in the recordings supports Carol's idea.
There are vibrations detected in recordings A and B but none at C, that indicates that the vibrations were local to the jumping site.
1 mark
(ii) Suggest one reason for the difference between the readings of sensor A and sensor B.
It is possible that more people or (heavier people ) jumped near A or fewer jumped at B.
OR
A is nearer the site than sensor B
1 mark
maximum 4 marks
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