ON17 P21 Q3 Open-open Tube Stationary Wave | Oct/Nov 2017 | Cambridge A Level 9702 Physics

9702/21/O/N/17: (a) State the difference between a stationary wave and a progressive wave in terms of
(i) the energy transfer along the wave,
(ii) the phase of two adjacent vibrating particles.
(b) A tube is open at both ends. A loudspeaker, emitting sound of a single frequency, is placed
near one end of the tube, as shown in Fig. 3.1.
The speed of the sound in the tube is 340 m s-1. The length of the tube is 0.60 m.
A stationary wave is formed with an antinode A at each end of the tube and two antinodes
inside the tube.
(i) State what is meant by an antinode of the stationary wave.
(ii) State the distance between a node and an adjacent antinode.
(iii) Determine, for the sound in the tube, the wavelength, and frequency
(iv) Determine the minimum frequency of the sound from the loudspeaker that produces a
stationary wave in the tube.
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[@lbrandon1227]

Im watching you from Mauritius🇲🇺😂

[@voyage-of-tranquility]

how can we be sure of the stationary wave we draw? also the question says it has an antinode, so doesn't it only mean one antinode?

[@an5i910]

If you read further it says "at each end of the tube and 2 inside" (there are 2 ends and 2 insides, hence = 4 A) so that means there are 4 Anti nodes (A), also by looking at the diagram we can confirm this fact. Also, How can we be sure of the stationary wave we draw? Well, b/w 2 adjacent (A) there is always a Node (N) so just draw 3 dotes denoting (N) and then draw the graph with highest peak in (A) and then connect them through the nodes. Hope this helps.

[@voyage-of-tranquility]

@@an5i910 thanks a million! you're an excellent teacher (you have a natural talent)! you cleared it out so well for me