EASY
Upper Secondary: IGCSE
IMPORTANT
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Alpha radiation is the most ionising radiation. What does this tell about how easily it is absorbed?

Important Questions on Radioactivity

EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
In an answer, a student wrote: "The half-life of a radioactive substance is the time taken for half of the atoms in a sample to decay". What word is missing from that definition of half-life?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
A sample of radioactive substance contains 200 undecayed atoms. How many will remain undecayed after 3 half-lives?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
The half-life of a radioisotope X is 10 days. A sample gives an initial count rate of 440 counts per second. What will be the count rate after 30 days?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
Radioisotope Y has a half-life of 2000 years. How long will it take the activity of a sample of Y to decrease to one -eighth of its initial value?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
Why would beta radiation not be suitable for use in a smoke detector?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
Why must gamma radiation be used for inspecting a welded pipe?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23
When medical equipment is to be sterilised, it is first sealed in a plastic wrapper. Why does this not absorb the radiation used?
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 23 - Radioactivity>Questions>Q 23

Why must the engineers shown in the figure use a source of gamma radiation?

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