JEE Main 2026 — Physics Waves & Oscillations
In an open organ pipe ν3 and ν6 are 3rd and 6th harmonic frequencies, respectively. If ν6−ν3=2200 Hz then length of the pipe is ____ mm . (Take velocity of sound in air is 330 m/s.)
Held on 22 Jan 2026 · Verified 6 Jul 2026.
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A simple pendulum of string length 30 cm performs 20 oscillations in 10 s. The length of the string required for the pendulum to perform 40 oscillations in the same time duration is $\_\_\_\_$ cm. [Assume that the mass of the pendulum remains same.]
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The time period of a simple harmonic oscillator is $T=2 \pi \sqrt{\frac{k}{m}}$. Measured value of mass $(m)$ of the object is 10 g with an accuracy of 10 mg and time for 50 oscillations of the spring is found to be 60 s using a watch of 2 s resolution. Percentage error in determination of spring constant $(k)$ is $\_\_\_\_$ \%.
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