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Question: Answered & Verified by Expert
A stationary wave equation is given as $y=20 \sin (20 x) \cos (1000 t)$.
What will be the speed of stationary wave?
PhysicsWaves and SoundJIPMERJIPMER 2019
Options:
  • A $20 \mathrm{~m} / \mathrm{s}$
  • B $50 \mathrm{~m} / \mathrm{s}$
  • C $2 \mathrm{~cm} / \mathrm{s}$
  • D not defined
Solution:
1836 Upvotes Verified Answer
The correct answer is: not defined
In stationary waves, the positions of nodes and antinodes do not change with time, hence speed of stationary wave is not defined.

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