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JIPMER2008PhysicsCurrent Electricity

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

As batteries wear out, temperature of filament of flash light attains lesser value, therefore intensity of radiation reduces. Also dominating wavelength ( _m ) in spectrum, which is the red colour, increases.

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