Q136 / 180 · JIPMER 2019 · Physics

A stationary wave equation is given as $y=20 \sin (20 x) \cos (1000 t)$. What will be the speed of stationary wave?

A
$20 \mathrm{~m} / \mathrm{s}$
B
$50 \mathrm{~m} / \mathrm{s}$
C
$2 \mathrm{~cm} / \mathrm{s}$
Correct answer
D
not defined

Solution

In stationary waves, the positions of nodes and antinodes do not change with time, hence speed of stationary wave is not defined.

Hence, the correct answer is option: 'D'.

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