Question

Cooling curves are drawn for three liquids a,b,c, shown in fig. for which liquid specific heat is least?

Answer 1

When a body cools by radiation,
`(d theta)/(dt) = -(k)/(ms) (theta-theta_(0)) :. (d theta)/(dt) prop 1/s`.
where s is specific heat, from graph we note that `d theta//dt` is more for liquid c, so sp. Heat is least for liquid c.