The densities of two substances are in the ratio `2: 3` and their specific heats are 0.12 and 0.09 CGS units respectively. The ratio of their thermal capacities per unit volume is

Options

A. `8: 9`
B. `1: 2`
C. `3: 2`
D. `4: 9`

Answer

A

Explanation

`("Thermal capacity (S)")/("Volume(V)") = s (m)/(v) = s rho`
`:. (S_(1)//V_(1))/(S_(2)//V_(2)) = (s_(1) rho_(1))/(s_(2) rho_(2)) = (0.12)/(0.09) xx (2)/(3) = (8)/(9)`