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  • Can someone explain A string of length 20 cm and linear mass density 0.40 g/cm is fixed at both ends and kept under tension 16N. A pulse at t=0 near one end occurs travelling toward other end. When will it have same shape

A string of length 20 cm and linear mass density 0.40 g/cm is fixed at both ends and kept under tension 16N. A pulse at t=0 near one end occurs travelling toward other end. When will it have same shape

  • Option 1)

    0.01 sec

  • Option 2)

    2 sec

  • Option 3)

    0.02 sec

  • Option 4)

    0.4 sec

 

Answers (1)

best_answer

v=\sqrt{\frac{F}{m}}= \sqrt{\frac{16}{0.040}}= 20m/s

For same shape = 20+20= 40cm

 time = 0.4/20= 0.02s

 

Reflection of wave-fixed end -

1)    There is a phase change of \pi for the reflected wave

2)    At boundary, same or all of the wave is reflected.

3)    When it is reflected from a fixed end, the wave is inverted.

-

 

 


Option 1)

0.01 sec

This is incorrect

Option 2)

2 sec

This is incorrect

Option 3)

0.02 sec

This is correct

Option 4)

0.4 sec

This is incorrect

Posted by

prateek

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