$f_B = 256 \pm 4 = 260$ or $252\,\text{Hz}$
Loading wax decreases $f_B$. If $f_B = 260$, it decreases → more beats. Since beats increased from 4 to 6, $f_B = 260\,\text{Hz}$.
Back to JEE Main 2023 Waves & Oscillations
JEE Main 2023 — Physics Waves & Oscillations
medium
mcq
2023
Official previous-year question
Verified 30 May 2026.
Question
Two tuning forks $A$ and $B$ produce $4$ beats per second. Fork $A$ has frequency $256\,\text{Hz}$. When $B$ is loaded with wax, beats become $6$ per second. The frequency of $B$ is:
Options
- A
$260\,\text{Hz}$
- B
$252\,\text{Hz}$
- C
$250\,\text{Hz}$
- D
$262\,\text{Hz}$
Solution
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