THE BRIGHTNESS OF the BULB IS OBSERVED TO DECREASEs gradually with its period of use beacause of

THE BRIGHTNESS OF the BULB IS OBSERVED TO DECREASEs gradually with its

1.	THE BRIGHTNESS OF the BULB IS OBSERVED TO DECREASEs gradually with its period of use beacause of
Answer» As you know, light BULB is made of a tungsten wire that has been kept a high temperature for many hours . High temperature evaporate tungsten from filament, decreases its radius . from $R=\rho\frac{l}{A}$ , we see decreased cross sectional area leads to an increase in the resistance of the filament. this INCREASING resistance with age means that the filament will carry less current the same applied VOLTAGE. With less current in the filament, there is less output and then filament GLOWS dimly. I hope you understand why brightness of bulb is observed to decrease GRADUALLY with its period of use.

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THE BRIGHTNESS OF the BULB IS OBSERVED TO DECREASEs gradually with its period of use beacause of

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