Fig. 5.1 shows a loudspeaker inside a glass bell-jar that contains air. [Figure 5.1] The loudspeaker produces a sound of frequency 2200 Hz.

1. (a)State what is meant by the frequency of a sound.[1]
2. (b)(i)The speed of sound in air is 330 m/s. Calculate the wavelength of the sound in the air.[2]
3. (b)(ii)The sound passes from the air into the glass. State what happens to
4. (b)(ii) 1.the frequency of the sound,[1]
5. (b)(ii) 2.the speed of the sound.
6. (c)(i) 1.how sound is produced by the loudspeaker,[1]
7. (c)(i) 2.how sound is transmitted through the air.[2]
8. (c)(ii)A pump is connected to the tube at the bottom of the glass bell-jar. The pump is switched on and it removes the air from the glass bell-jar. Explain why the volume of the sound heard outside the glass bell-jar decreases.[1]

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