A piece of stone weighs \(80 \mathrm{~g}\) in air, \(50 \mathrm{~g}\) when completely immersed in water and \(65 \mathrm{~g}\) in liquid \(\mathrm{Y}\). What is the relative density of \(\mathrm{Y}\) ?
A. \(0.2\) B. \(1.5\) C. \(0.5\) D. \(2.0\)
Correct Answer: C
Explanation
Mass of stone in air \(=80 \mathrm{~g}\) Mass of stone in water \(=50 \mathrm{~g}\) Mass of stone in liquid \(\mathrm{Y}=65 \mathrm{~g}\) R.D. of \(Y=\frac{80 g-65 g}{80 g-50 g}\) \(=\frac{15 \mathrm{~g}}{30 \mathrm{~g}}=0.5\)
