Radioactivity

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Radioactivity

Which of these is not a natural source of background radiation? *

1 point

Medical x-rays

Cosmic rays

Rocks

A teacher used a Geiger counter to measure the radiation emitted by a radioactive rock. Wrapping the rock in paper and aluminium foil had no effect on the count rate. Which statement is true? *

1 point

The rock emits alpha radiation

The rock emits beta radiation

The rock emits gamma radiation

The rock emits alpha and beta radiation

The half-life of an isotope is 1 hour. How long will it take the count rate to fall to one quarter of the starting rate? *

1 point

15 minutes

1 hour

2 hours

4 hours

What happens to the half life of a substance when it is put into a freezer? *

1 point

It doubles

It halves

It stays the same

Which combination of features would be best when choosing a radioactive source for use a medical tracer?

1 point

An alpha emitter with a short half life

A beta emitter with a long half-life

A gamma emitter with a short half life

A gamma emitter with a long half life

Clear selection

What type of radioactive decay is shown below?

1 point

Alpha decay

Beta decay

Gamma decay

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What type of radioactive decay is shown below? *

1 point

Alpha decay

Beta decay

Gamma decay

Which statement explains how the decay shown above works? *

1 point

During this decay the nucleus emits an electron

During this decay a proton in the nucleus turns into a neutron and an electron. The electron is then emitted.

During this decay a neutron in the nucleus turns into a proton and an electron. The electron is then emitted

During this decay a neutron turns into an electron. The electron is then emitted from the nucleus.

For the following equation, pick the correct mass and atomic number for Polonium *

1 point

Mass number = 84, Atomic number = 215

Mass number = 88, Atomic number = 223

Mass number = 215, Atomic number = 84

Mass number = 223, Atomic number = 88

In the equation above, how many neutrons does Radon have? *

1 point

133

219

305

Which is the correct definition of contamination?

1 point

The unwanted presence of materials containing radioactive atoms on other materials.

The process of exposing an object to nuclear radiation.

Clear selection

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This form was created inside of Stoke Newington School and Sixth Form.