A smoke detector, shown in the figure below - consists of a light source and a light detector which triggers an alarm when light falls on it. The smoke detector works on the principle of scattering of light by particles in the smoke.

In the figure above, where should the light-detector be fitted, and where should the entry of the smoke be from? Choose the BEST answer.
Answers
Answered by
5
Answer:
where is the figure ?
Answered by
2
Answer:
D
Explanation:
light detector should be put in q and entry from q to r
( i know the figure :) )
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