Q. A set of 24 tuning fork are so arranged that each gives 6 beats/s with the previous one. If the frequency of the last tuning fork is double that of the first, frequency of the second tuning fork is
A) 138 Hz
B) 132 Hz
C) 144 Hz
D) 272 Hz
Explanation
(c) The frequencies of tuning fork are the term of an AP whose common difference is 6.
∴ ι=a+(n-1)d
2a=a+(24-1)×6
a=23×6=138
∴ second frequency =135+6=144 Hz
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.