Q 11. There are four samples P, Q, R, and S, with natural frequencies 64, 96, 128 and 256 Hz, respectively. There are mounted on test setups for conducting vibration experiments. If a loud pure note of frequency 144 Hz is produced by some instrument, which of the samples will show the most perceptible induced vibration?
(A) P
(B) Q
(C) R
(D) S
Answer: (C)
Explanation:
