Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202628 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
28 January
Shift
Evening Shift
Subject
Physics
Chapter
Waves and Sound

JEE Main 2026 · 28 January · Evening Shift · Physics · Waves and Sound

Two tuning forks A and B are sounded together giving rise to 8...

Two tuning forks AA and BB are sounded together giving rise to 8 beats in 2 s. When fork AA is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork BB is 380 Hz then original frequency of tuning fork AA is ____\_\_\_\_ Hz.

Correct answer

384

Step-by-step solution

∣fA−fB∣=4|f_A - f_B| = 4
∣fA−380∣=4|f_A - 380| = 4
So, fA=384f_A = 384 Hz or 376376 Hz
on loading with wax fAf_A decreases
So, fA=384f_A = 384 Hz
Practice Waves and Sound on Quantrex Academy →

More from Waves and Sound

List-I shows four configurations made of straight and semi-circular narrow tubes… JEE Advanced 2026A transverse wave on a string is described by y = 3 (36t + 0.018x + π/4) , where x, y are… JEE Main 2026The equation of a plane progressive wave is given by y = 5 π(200t - (x)/(150)) where x… JEE Main 2026The speed of a longitudinal wave in a metallic bar is 400 ~m / s . If the density and… JEE Main 2026A point source is kept at the center of a spherically enclosed detector. If the volume of… JEE Main 2026The fifth harmonic of a closed organ pipe is found to be in unison with the first… JEE Main 2026The velocity of sound in air is doubled when the temperature is raised from 0^ ∘ C to α^… JEE Main 2026In an open organ pipe ν_ 3 and ν_ 6 are 3^ rd and 6^ th harmonic frequencies… JEE Main 2026 Full Waves and Sound list All JEE Main PYQs