Question

If Young's modules of the material of a rod is Y and density is P then time taken by sound wave to travel l length from bottom is.

• A. $l\sqrt{\frac{p}{Y}}$
• B. $l\sqrt{\frac{Y}{p}}$
• C. $\frac{1}{l}\sqrt{\frac{Y}{p}}$
• D. $\frac{1}{l}\sqrt{\frac{p}{Y}}$

Answer 1

The correct option is A $l\sqrt{\frac{p}{Y}}$

$\begin{array}{c}\text{Speed of sound in material}=\sqrt{\frac{\text{young.}}{\text{densily}}}\\ \text{Distance}=l\\ \therefore \text{time taken}=\frac{l}{\sqrt{\frac{y}{p}}}=l\sqrt{\frac{p}{y}}\end{array}$