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Heating Effect of Electric Current

The unit of l...

Question

The unit of luminous efficiency of electric bulb is------

A

Watt

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B

Lumen

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C

Lumen/watt

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D

Lux

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Solution

The correct option is C Lumen/watt
luminous efficiency ( $η$ ) of electric blub is given by
$η = \frac{l u m i n o u s f l u x}{P o w e r}$
Hence the unit of $η$ is lumen/watt.

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