1.

The quantities of heat required to raise the temperatures of two copper spheres of radii r_(1) and r_(2) (_(1)=1.5 _(2)) through 1 Kare in the ratio of

Answer»

`(27)/(8)`
`(9)/(4)`
`(3)/(2)`
1

Solution :REQUIRED heat, `Q prop ^(2)`
where R is the radius.
`therefore (Q_(1))/(Q_(2))=(r_(1)^(2))/(r_(2)^(2))`
`(Q_(1))/(Q_(2))=((1.5)^(2))/((1)^(2))`
`(Q_(1))/(Q_(2))=(9)/(4)`.
So, CORRECT choice is (b).


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