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Waves question

2017 · 9 Apr · Shift 1 · Q61
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Waves question

2017 · 9 Apr · Shift 1 · Q61

JEE MainPhysicsWavesMCQ+4 / −1
A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by y(x, t) = 0.5 sin (5π4x) \left( {{{5\pi } \over 4}x} \right)\,(45π​x) cos(200 π\piπ t). What is the speed of the travelling wave moving in the positive x direction ? (x and t are in meter and second, respectively.)
  1. A
    160 m/s
  2. B
    90 m/s
  3. C
    180 m/s
  4. D
    120 m/s
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