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Wavelength of Visible Light

In a filament...

Question

In a filament type light bulb, most of the electric power consumed appears as:

(a) visible light
(b) infra-red-rays
(c) ultraviolet rays
(d) fluorescent light

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Solution

(b) infra-red rays
This is so because of the heat produced when a filament type light bulb glows.

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