Two electric bulbs have tungsten filament of same length. If one of them gives 60 watt and other 100 watt, then

R∝1PHence resistance of 60 watt bulb will be more than resistance of 100 watt bulbFurther R=ρ1πr2  or  R∝1r2So, the radius of 1o0 watt bulb will be more than 60 watt bulb, Hence 100 watt bulb has thicker filament.