Question

3.
The solid line in the graph shows the variation with distance x of the displacement y of a
travelling wave at t=0. The dotted line shows the wave 0.20 ms later. The period of the wave
is longer than 0.20 ms.
N
y / cm
0.2
0.8
10
x/m
-6
(a) (i)
Calculate, in ms, the speed for this wave.
[1]
(ii)
Calculate, in Hz, the frequency for this wave.
121​

Answer 1

Answer:

The graph shows the variation with distance x of the displacement y of the particles in the medium. The solid line and the dotted line show the displacement at t=0 and t=0.882 ms, respectively. The period of the wave is greater than 0.882 ms. A displacement to the right of the equilibrium position is positive.

Explanation:

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