passwella.
Menu

JAMB Physics 2011 Question 26

Question 26

Waves

A length of wire has a frequency of 255 Hz when stretched by a force of 225 N. If the force increases to 324 N, what is the new frequency of vibration?

  1. A.488 Hz
  2. B.356 Hz
  3. C.306 Hz
  4. D.512 Hz
Show the answer and explanation

Answer: C (306 Hz)

Explanation

f ∝ √T, so f2 = 255 × √(324/225) = 255 × 18/15 = 306 Hz.