Question

A tuning fork P of frequency 280 Hz produces 6 beats/s with unknown tuning fork Q.
Column-I Column-II
A) P is waxed and number of beats is decreased P) Frequency of Q is 286 Hz
B) Q is filed and and number of beats is decreased Q) Frequency of Q is 274 Hz
C) P is filed and number of beats remains same R) Frequency of Q is 272 Hz
D) Q is filed and number of beats is increased S) Frequency of Q is 282 Hz

• A. A-Q, B-R, C-S, D-R
• B. A-Q, B-R, C-Q, D-P
• C. A- PQ, B-QR, C-RS, D-P
• D. A-RS, B-QR, C-S, D-R

Answer 1

The correct option is B A-Q, B-R, C-Q, D-P

on waxing the frequency of a tuning fork decreases and on filing the frequency of a tuning fork increases .

so in option A on waxing P frequency of P decreases and as given beats are also decreased so fork P was having higher frequency then fork Q , so

frequency of fork $Q=280-6$

so $Q=6$

in option D on filing Q no of beats are increased means that Q is having higher frequency so

frequency of $Q=280+6$

$Q=6$

so the answer containing these 2 is B