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A wave in a string has an amoplitude of ...

A wave in a string has an amoplitude of 2cm. The wave travels in the postivei direction of x-axis with a speed of `128 ms^(-1)` and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

A

y = (0.02)m sin (7.58x – 1005 t)

B

y = (0.02)m sin (7.85x + 1005 t)

C

y = (0.02)m sin (15.7x – 2010 t)

D

y = (0.02)m sin (15.7x + 2010 t)

Text Solution

Verified by Experts

The correct Answer is:
A
`5 lambda=4 `
` lambda=(4)/(5)`
`k=(2 pi)/ lambda=(10pi)/(4)=7.85`
wave moves along positive X-direction
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