Solution:
In series, current remains same. So, power P is proportional to resistance R, i.e, . Now, resistance of carbon is more than a metal since carbon is a nonmetal. So, carbon filament glows more brightly. Also, carbon is not a semiconductor.
Statement 1: Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulb will glow more brightly than carbon filament bulb.
Statement 2: Carbon is a semiconductor.
In series, current remains same. So, power P is proportional to resistance R, i.e, . Now, resistance of carbon is more than a metal since carbon is a nonmetal. So, carbon filament glows more brightly. Also, carbon is not a semiconductor.