Q. A 5.5 m length of string has a mass of 0.035 kg. If the tension in the string is 77 N, the speed of a wave on the string is
A) $110ms^{- 1}$
B) $165m^{- 1}$
C) $77ms^{- 1}$
D) $102ms^{- 1}$
Explanation
(a) $m = \frac{0.035}{5.5}kg\ m^{- 1},T = 77N$
$v = \sqrt{T/m} = \sqrt{\frac{77 \times 5.5}{0.035}} = 110ms^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.