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  • Need clarity, kindly explain! - Oscillations and Waves - JEE Main-7

The phase difference between two points seperated by 1 m in a wave of frequency 120 Hz is 90\degree. The wave velocity is 

  • Option 1)

    180 m/s

  • Option 2)

    240 m/s

  • Option 3)

    480 m/s

  • Option 4)

    720 m/s

 

Answers (1)

best_answer

Path difference A = \frac{\lambda}{2\pi } X \phi \Rightarrow 1 = \frac{\lambda}{2\pi } X \frac{\pi }{2} \Rightarrow \lambda = 4 m

Hence v = n\lambda = 120 X 4 = 480 m/s

 

Wave function -

Function which can mathematically represent a moving wave pulse are called wave function.

- wherein

y\left ( x,t \right )= f\left ( x\pm vt \right )

 

 

 


Option 1)

180 m/s

It is incorrect.

Option 2)

240 m/s

It is incorrect.

Option 3)

480 m/s

It is correct.

Option 4)

720 m/s

It is incorrect.

Posted by

divya.saini

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