Two identical metal rods P and Q have coefficients of linear expansion of and respectively

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Two identical metal rods P and Q have coefficients of linear expansion of

1.8\times10^{-5}\,\text{K}^{-1}

and

1.2\times10^{-5}\,\text{K}^{-1}

respectively. Which statement about their coefficients of cubical expansion (γ) is correct? (a)

\gamma_P = \gamma_Q

(b)

\gamma_P = 2.25\,\gamma_Q

(c)

\gamma_P

is greater than

\gamma_Q

(d)

\gamma_P

is smaller than

\gamma_Q