Question

Two Electric bulbs have filaments of length
1 and 21, diameters 2d and d. The emissivities
of the bulbs are 3e, 4e with temperatures in
the ratio 2:3. Their radiant powers will be in
the ratio
1) 4 : 27 2) 8:9 3) 1:8 4) 2:9​

Answer 1

Answer:

option c is the right answer

Answer 2

Answer:

TWO ELECTRIC BULB HAVE FILAMENTS OF LENGTH

1 AND 21

DIAMETER

2D AND D

THE EMISTIVES OF BULB ARE

3E AND 4E

WITH TEMPERATURE IN THE RATIO

2:3 THEIR RADIANTS POWER WILL BE IN THE RATIO

1=4:27 2

2=8:93

3=1:84

4=2:4