Physics · Oct / Nov 2020 · Paper 41 · Question 10
0625
As printed in the paper
The question as text
A radiation detector is placed on the bench in a laboratory. It detects a background count rate of 40 counts / minute.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
10(a)[2]
radiation that is always present or due to environment or in everyday life
soil / rocks / earth / cosmic rays / space / Sun / weapons testing / radon / nuclear waste
10(b)(i)[2]
alpha-emission (only)
alpha-particles do not penetrate (two sheets of) paper or β-particles and γ-rays pass through (two sheets of) paper → ߙ
ସ / He
ଶ଼
ସ
ସ
ଶ
ଶ
10(b)(ii)[3]
Po
204Pb... or 82Pb
204
82Pb
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