Question

The quantities of heat required to raise the temperature of two solid copper spheres of radii r_{​​​​​​1} and r_{​​​​​​2} (r_{​​​​​​1}= 1.5 r₂) through 1 K are in the ratio :

(1) 5/3

(2) 27/8

(3) 9/4

(4) 3/2