Question

whose gas filled in bulb ​

Answer 1

Answer:

ARGON.

Argon is the gas which is filled in the bulb.

Hope it helps you...

Thanks..

Answer 2

$\huge\fcolorbox{black}{yellow}{Answer-:}$

Argon

Explanation-:

Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum.