Question detail
Describe how alpha radiation is used in some smoke alarms.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Hazards and uses of radioactive emissions and of background radiation
Question
Describe how alpha radiation is used in some smoke alarms.
Answer
Alpha radiation is used in smoke alarms to ionise the air between two electrodes. This ionisation allows a small current to flow. When smoke enters the alarm, it absorbs the alpha particles, reducing the ionisation and current, which triggers the alarm.
Explanation
This question evaluates the student's knowledge of the specific type of radiation used in smoke alarms and its function in the detection process. It reinforces the concept of ionisation and its practical implications in safety devices.
Common mistake
Misunderstanding Smoke Alarm Function
Students often think that smoke alarms only detect smoke particles without understanding the role of ionisation.
Explain that smoke entering the ionisation chamber disrupts the ionisation process, reducing current flow and triggering the alarm.
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