Two spheres, one solid and other hollow are kept in atmosphere at same temperature. They are made of same material and their radii are also same. Which sphere will cool at a faster rate initially?

Two copper spheres of the same external radius, one solid but the other hollow, are heated up to a certain temperature and then are allowed to cool under similar condition. Which sphere will cool faster ?

Two spheres of the same radii, one solid and other hollow are charged to the same potential, which one has greater charge?

The ratio of specific heats of two spheres is 2:3, radii 1:2, emissivity 3:1 and density 1:1. Initially, they are kept at same temperatures in atmosphere. Which sphere will cool at a faster rate initially.

The ratio of specific heats of two spheres is 2:3, radii 1:2, emissivity 3:1 and density 1:1. Initially, they are kept at same temperatures in atmosphere. Which sphere will cool at a faster rate initially.

Two sphere of same radius and material, one solid and one hollow are heated to same temperature and kept in a chamber maintained at lower temperature at t = 0 -

Two spheres of radii R_(1) and R_(2) are made of the same material and are at the same temperature. The ratio of their thermal capacities is:

A solid sphere and a hollow sphere of the same material and of equal radii are heated to the same temperature.