Waves - Result Question 48

50. A string of 7m length has a mass of 0.035kg. If tension in the string is 60.5N, then speed of a wave on the string is

[2001, 1989]

(a) 77m/s

(b) 102m/s

(c) 110m/s

(d) 165m/s

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Answer:

Correct Answer: 50. (c)

Solution:

  1. (c) Given : Length (l)=7m

Mass (M)=0.035kg and tension (T)=60.5N.

Therefore, mass of string per unit length (m)= 0.0357=0.005kg/m

speed of wave, =Tm

60.50.005=110m/s



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