Unit 1 Physics: Matter

Beta-minus radiation is:

• A energy emitted from an electron of an atom

• B an electron ejected from an atom

• C a helium nucleus emitted from an atom

• D an electron emitted from the nucleus of an atom

Which of the following travels at the greatest speed?

• A gamma radiation

• B beta radiation

• C alpha radiation

• D They all have the same speed.

The heaviest form of radiation is:

• A gamma

• B beta-minus

• C alpha

• D none of the above

The type of radiation that is most ionising is:

• A gamma

• B beta

• C alpha

• D none of the above

The most penetrating form of radiation is:

• A gamma

• B beta

• C alpha

• D none of the above

The type of radiation we are exposed to from the Sun is:

• A gamma

• B beta

• C alpha

• D none of the above

The value of x in the decay equation is:

• A 238

• B 236

• C 234

• D 232

Cobalt-60 has a half-life of 5.3 years. A sample of pure cobalt-60 has a mass of 50 µg. How much of the Co-60 remains after 10.6 years?

• 12.5 µg

• 125g

• 1.25mg

• 125 µg

When exploring the nature of the nucleus, electrons were not fired at nuclei because:

• A they were too small

• B they travelled too fast

• C they bonded to the atom

• D they couldn’t get past the outer shell electrons

Nuclear fission is:

• A joining together of two or more small nuclei

• B splitting a nucleus into two or more pieces

• C absorbing a neutron

• D undergoing radioactive decay