Question

You are provided with three similar, but slightly different, tuning forks, when A and B are both struck, a beat frequency of $f_{AB}$ is heard. When A and C are both struck, beat frequency of $f_{AC}$ is heard. It was noticed that $f_{AB}<f_{AC}$. This experiment is repeated after coating tuning fork A with a little wax. Now it is observed that values of both $f_{AB}$ and $f_{AC}$ increase. Which tuning fork has the highest frequency?

• A. A
• B. B
• C. C
• D. The answer cannot be determined from the information given

Answer 1

Answer: (C)

C

order of frequency will be $f_C>f_B>f_A$. because we are given, $f_{AC}>f_{AB}$,

and after coating to fork A $f_A$ reduces, and hance both $f_{AC}$

and $f_{AB}$ increases. SO "C" must be having lagest frequency.
option "C" is correct.