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 then red with no change in intensity
C. It stops working suddenly while giving white light
D. Colour changes to red and also intensity gets reduced

Answer

D

Explanation

As battery wears out, temperature of filament attains lesser value.
Hence, intensity of radiation reduces also dominating wavelength (`lambda_m`) in spectrum increases.