Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out

Options

A. the light intensity gets reduced with no change in its colour
B. light colour changes first to yellow and the red with no change in intensity
C. it stops working suddenly while giving white light
D. colour changes to red and also intensity gets reduecd.

Answer

D

Explanation

If the voltage is not sufficent to heat it is white hot temperature, the filament will become red. Buit intensity will be very much reduced because of low voltage. But if the voltage. But if the voltage is only reduced a little only intesity will be reduced. It can be (a) also.