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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

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