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Standard VIII
Physics
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
=
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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