Organ pipe will have frequency either 255 or 257Hz. Using 255Hz,
255=2l3v,⇒l=2×2553×340m⇒l=200cm. Using 257Hz,257=2l′3v⇒l′=2×2573×340m=198cm.
A tuning fork vibrates with frequency 256Hz and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe? (speed of sound in air is 340ms−1)
Held on 15 Apr 2018 · Verified 6 Jul 2026.
220cm
200cm
190cm
180cm
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Work through every JEE Main Waves & Oscillations PYQ, year by year.