NEET UG PHYSICS MCQ: WAVES

1 Hard

1 of 1

Application +4 | -1

A stone hangs in air from one end of a wire which is stretched over a sonometer. The wire is in unison with a certain tuning fork when the bridges of the sonometer are

45 \mathrm{~cm}

apart. Now the stone hangs immersed in water at

4^{\circ} \mathrm{C}

and the distance between the bridges has to be altered by

9 \mathrm{~cm}

to re-establish unison of the wire with the same fork. Calculate the density of the stone.

View answer and explanation

Correct option: B

2.778 \mathrm{~g} \mathrm{~cm}^{-3}

Option B (

2.778 \mathrm{~g} \mathrm{~cm}^{-3}

) is correct because it is calculated using the change in length required to maintain the same frequency when the stone is immersed in water, considering the buoyant force.

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