KS3 Questions on Sound
Q11.
(a)
(i) Air contains nitrogen.
In the box below a circle represents a nitrogen atom.
![](pic12a.png)
Draw five nore circles, to show the arrangement of particles in nitrogen gas.
1 mark
(ii) Zeena carries a personal emergency alarm. It uses nitrogen gas to produce a very loud sound. The nitrogen gas in the container is under much higher pressure than the nitrogen gas in the air.
![](pic12.png)
How does the arrangement of nitrogen particles change when the gas is under higher pressure?
1 mark
(b) Use words from the list below to complete the sentence.
- greater than
- equal to
- less than
The rate at which the nitrogen particles hit the inside of the container is .................................... the rate at which nitrogen particles hit the outside of the container.
1 mark
(c) Zeena pushes the lid down and nitrogen gas escapes through the diaphragm. The diaphragm vibrates and produces a sound.
The pattern on the oscilloscope screen below represents the soundwave produced by the alarm.
(i) The loudness of the sound produced by the alarm decreases between X and Y. How can you tell this from the graph?
1 mark
(ii) The pitch of the sound produced by the alarm stays the same between X and Y. How can you tell this from the graph?
1 mark
maximum 5 marks
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