11PH - Nuclear, Sub-atomic, Big Bang

Beta radiation is:

• energy emitted from an electron of an atom.

• an electron ejected from an atom.

• a helium nucleus emitted from an atom.

• an electron emitted from the nucleus of an atom.

Which of the following travels at the greatest speed?

• gamma radiation.

• beta radiation.

• alpha radiation.

• They all have the same speed.

The heaviest form of radiation is:

• gamma.

• beta.

• alpha.

• none of the above.

The type of radiation that is most ionising is:

• gamma.

• beta.

• alpha.

• none of the above

The most penetrating form of radiation is:

• gamma.

• beta.

• alpha.

• none of the above.

The value of x in the decay equation is:

• 238

• 236

• 234

• 232

The number of neutrons in the atom is:

• 93

• 137

• 147

• 240

Magnesium-23 has a half-life of 11 seconds. How long would it take so that only 12.5% of a sample would remain?

• 33 seconds

• 44 seconds

• 88 seconds

• 137.5 seconds

A radioactive sample of oxygen-15 has a half-life of 110 minutes. If the mass of the radioisotopes remaining after 5.5 h is 0.80 g, the original mass of radioisotopes in the sample had a mass of:

• 2.4 g

• 2.8 g

• 6.4 g

• 9.6 g

During beta plus ( $\beta+$  ) decay what is emitted from the nucleus

• An electron and a neutrino

• An electron and an anti-neutrino

• A positron and a neutrino

• A positron and an anti-neutrino