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Which of the following statements are true for a stationary wave?

a) every particle has a fixed amplitude which is different from the amplitude of its nearest particle

b) all the particles cross their mean position at the same time

c) all the particles are oscillating with the same amplitude

d) there is no net transfer of energy across any plane

e) there are some particles which are always at rest

 

Answers (1)

The answer is the option (a) (b) (d) and (e)

In a stationary wave, the particles between two nodes vibrate with different amplitude, which increases from node to antinode (0 to maximum) and decreases from antinode to node. The amplitude of particles varies with \lambda. The particles at a node are at rest, and hence there is no net transfer of energy. The particle between two nodes is in the same phase. The motion of particles between two nodes will be either upward or downward crossing the mean position at the same time. Hence, a,b,d and e are correct.

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