A metal wire of length 'L' and density 'd' floats horizontally on the free surface of water. The maximum radius of the wire does not sink in water is
[ $T$ = surface tension of water , $g$ = gravitational acceleration]

The energy needed for breaking a liquid drop of radius 'R' into 'n' droplets each of radius 'r' is
[ $T$ = surface tension of the liquid]

In most liquids, with rise in temperature surface tension of liquid

Out of the following, which statement is NOT true about black body radiation ?