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NEET2006PhysicsCurrent ElectricityActual

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

Options

  1. Athe light intensity gets reduced with no change in its colour
  2. Blight colour changes first to yellow and then red with no change in intensity
  3. Cit stops working suddenly while giving white light
  4. Dcolour changes to red and also intensity gets reduced.

Correct answer

D. colour changes to red and also intensity gets reduced.

Step-by-step solution

If the voltage is not sufficient to heat it to white hot temperature, the filament will become red. But the intensity will be very much reduced because of low voltage. But if the voltage is only reduced a little only intensity will be reduced. It can be (1) also.

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