Radioactive decay

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Radioactive decay

1

Gamma radiation can be significantly reduced by…

Paper

Aluminium

Lead

2

What form of radiation is emitted by nuclei with too many neutrons?

Alpha

Gamma

Beta

3

Gamma radiation is…

An electromagnetic wave

A helium nucleus

An electron

4

Which form of radiation has the highest ionising power?

Gamma

Alpha

Beta

5

What causes an atom’s nucleus to become unstable?

Too many or too few neutrons in the nucleus

More electrons than protons

Fewer electrons than protons

6

What is the activity of a source that emits 1,200 particles per minute?

1,200 Bq

20 Bq

72,000 Bq

7

Uranium 238 emits an alpha particle to become what nucleus?

Thorium-234

Thorium-239

Thorium-236

8

An alpha particle is…

An electron

A helium nucleus

An electromagnetic wave

9

Which type of radiation can reach the furthest?

Beta

Gamma

Alpha

10

What fraction of a radioisotope has decayed after two half-lives? – Higher

One quarter

All of it

Three quarters


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