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Is it true that smoke detectors use radioactive materials?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
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 ionisation. A radioisotope is used in ionisation smoke detectors, especially

americium - 241

. It is cheaper and more sensitive than optical detectors.

Americium - 241

emits alpha rays. It ionises air by which smoke is detected and generates an alarm.

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