A string under tension produces a note of frequency 14Hz....
A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.
14Hz
18Hz
28Hz
56Hz
Correct answer is C
The formula for the frequency in a stringed instrument : \(f = \frac{1}{2} \sqrt{\frac{T}{m}}\)
f = frequency; T = tension in the string; m = mass per unit lenth of the string.
f\(_1\) = 14 = \(\frac{1}{2} \sqrt{\frac{T}{m}}\).
When T is quadrupled, we have
f\(_2\) = new frequency = \(\frac{1}{2} \sqrt{\frac{4T}{m}}\)
= 2(\(\frac{1}{2} \sqrt{\frac{T}{m}}\))
= 2 f\(_1\)
= 2 x 14
= 28 Hz
Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny par...
Which of the following electromagnetic wave can be detected by its heating effect? ...
Which of the following is not a component of a d.c. electric motor? ...
A bead travelling on a straight line wire is brought to rest at 0.2 by friction. If the mass of...