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NEET 1989 (AIPMT) · Speed of Waves

Speed of Waves question from NEET 1989 (AIPMT)

Q39NEET 1989 · AIPMTEasy

Speed of Waves

A 5.55.5 metre length of string has a mass of 0.035 kg0.035\text{ kg}. If the tension in the string in 77 N77\text{ N}, the speed of a wave on the string is

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Answer: (a)

  1. μ=0.035/5.5=6.36×10−3 kg/m\mu = 0.035/5.5 = 6.36\times10^{-3}\ \text{kg/m}
  2. v=T/μ=77×5.50.035=12100v = \sqrt{T/\mu} = \sqrt{\dfrac{77 \times 5.5}{0.035}} = \sqrt{12100}
  3. So the answer is (a) 110 m s−1110\ \text{m s}^{-1}.
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