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Q.

Is it true that smoke detectors use radioactive materials?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Smoke detectors: Smoke detectors are used in malls, hotels, houses etc. It senses smoke and alarms us of fire. It senses smoke by photoelectric effect or by ionization. A radioisotope is used in ionization smoke detectors, especially americium-241. It is cheaper and more sensitive than optical detectors. Americium-241 emits alpha rays. It ionizes air by which smoke is detected and an alarm is generated.
 
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