The radius of two bodies made of same material is 1 m and 4 m respectively. Their temperature is 4000 k and 2000 k. Show that the radiant energy per second for them is not different.

The ratio of the radii of two spheres made of the same material 1:4. The ratio of their thermal capacities is

State Stefan’s Law. The radii of two spheres are 1 m and 4 m and temperatuiie 4000 K and 2000 K respectively. Calculate the ratio of the energy radiated per second.

The difference in lengths of two rods, made up of different materials, remains constant at all temperatures. Show that their lengths at 0^(@)C are inversely proportional to their coefficients of linear expansion.

The difference in lengths of two rods, made up of different materials, remains constant at all temperatures. Show that their lengths at 0^(@)C are inversely proportional to their coefficients of linear expansion.

Ratio of the cross sectional areas of two wires A and B made up of the same material is 1 : 4 . If the Wires are connected across the same potential difference , find the ratio of heat produced in them .