iGCSE Physics (0625) 5.2.1 Detection of radioactivity Paper 1-2023,2024&2025

Question

The diagram shows a radioactivity experiment.

When a piece of paper is used as the absorber, the count rate drops to the background count rate.

Which radiation is the source emitting?

A $\alpha$ -radiation only

B $\beta$ -radiation only

C $\gamma$ -radiation only

D $\alpha$ -radiation, $\beta$ -radiation and $\gamma$ -radiation

Answer/Explanation

Ans: A

Question

The graph shows how the count rate from a radioactive sample changes with time.

What is the half-life for this sample?

A 90 s

B 120 s

C 200 s

D 400 s

Answer/Explanation

Ans: B

Question

Which statement about α -particles and $\gamma$ -rays is correct?

$\alpha$ -particles are a form of electromagnetic radiation.
$\alpha$ -particles penetrate materials more easily than $\gamma$ -rays.
The emission of an $\alpha$ -particle produces a nucleus of a different element.
$\gamma$ -rays are more ionising than $\alpha$ -particles.

Answer/Explanation

Ans: C

Question

The graph shows the activity of a radioactive source over a period of time.

What is the half-life of the source?

A 1.0 minute

B 2.0 minutes

C 2.5 minutes

D 4.0 minutes

Answer/Explanation

Ans: B

Question

A student measures the level of radiation emitted by a radioactive sample.

The table shows the readings she records on the counter over a short period of time.

counter reading

/ counts per minute

106

100

The sample is removed and the counter then shows a background radiation reading of 4 counts per minute.

What is the best estimate for the average count rate due to the radioactive sample?

A 96 counts per minute B 98 counts per minute C 100 counts per minute D 104 counts per minute

Answer/Explanation

Ans: A

iGCSE Physics (0625) 5.2.1 Detection of radioactivity Paper 1-2023,2024&2025

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