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Which one of the following does not convert electrical energy into light energy? |
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(a) |
A candel |
(b) |
A light-emitting diode |
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(c) |
A laser |
(d) |
A television set |
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Which one of the following does not convert electrical energy into light energy? |
|||
|
(a) |
A candel |
(b) |
A light-emitting diode |
|
(c) |
A laser |
(d) |
A television set |