Q. The tension in a piano wire is 10N. What should be the tension in the wire to produce a note of double the frequency
A) $5\ N$
B) $20\ N$
C) $40\ N$
D) $80\ N$
Explanation
(c) $n \propto \sqrt{T} \Rightarrow \frac{n_{1}}{n_{2}} = \sqrt{\frac{T_{1}}{T_{2}}} \Rightarrow \frac{n}{2n} = \sqrt{\frac{10}{T_{2}}} \Rightarrow T_{2} = 40N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.