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(B) The frequency of a tuning fork is given by the relation $n = \frac{1}{2l} \sqrt{\frac{Y}{\rho}}$,where $Y$ is Young's modulus and $\rho$ is the de

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Decreases

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(B) The frequency of a tuning fork is given by the relation $n = \frac{1}{2l} \sqrt{\frac{Y}{\rho}}$,where $Y$ is Young's modulus and $\rho$ is the density of the material.As the temperature increases,the Young's modulus $Y$ of the material decreases,and the length $l$ of the prongs increases due to thermal expansion.Both these factors contribute to a decrease in the frequency of the tuning fork.The relationship is given by $n_t = n_0(1 - \alpha t)$,where $n_t$ is the frequency at $t^\circ C$,$n_0$ is the frequency at $0^\circ C$,and $\alpha$ is a constant related to the material properties.Therefore,the correct option is $B$.

When temperature increases,the frequency of a tuning fork

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