Fig. 12.1 illustrates some apparatus used in a demonstration. The glass jar is attached to a vacuum pump. The electric bell is switched on, and the observers can see and hear it operating.
(a(i))[2]
State what the observers see and what they hear once the air has been removed.
(a(ii))[2]
State what the demonstration in (a)(i) reveals about how sound waves are transmitted.
(a(iii))[1]
Describe the way the gong creates the sound.
(b)[2]
State the lowest and highest frequencies audible to the human ear. Tick one box in each column.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “electric bell is operating (owtte)” …