PHYSICS FORM 4 -RADIOACTIVITY

1.	What is background radiation due to?

A. Nuclear fallout

B. Rocks

C. Cosmic rays

D. All of the above

2.	What is an alpha particle?

A. A particle which has one neutron and one proton

B. A proton

C. A neutron

D. A particle which has two neutrons and two protons

3.	What is a beta particle?

A. An electron

B. A high energy proton

C. A high energy electron

D. Two protons and two neutrons

4.	What is gamma radiation?

A. A form of electromagnetic radiation

B. An electron

C. A proton

D. A neutron

5.	Which type of radiation would be blocked by a thin sheet of paper?

A. Alpha

B. Beta

C. Gamma

D. None of the above

6.	Which type of radiation would be blocked by a thin sheet of aluminium – but not by paper?

A. Alpha

B. Beta

C. Gamma

D. They all get blocked

7.	Which type of radiation would be blocked by several inches of lead – but not by a thin sheet of aluminium or paper?

A. Alpha

B. Beta

C. Gamma

D. Beta and Gamma

8.	What types of radiation can be deflected by electric and magnetic fields?

A. Alpha

B. Alpha and Beta

C. Alpha and Gamma

D. Beta and Gamma

9.	What is the half-life of a radioactive isotope?

A. The time it takes to be deadly to humans

B. The number of isotopes in a sample

C. The time it takes for the isotope in a sample to half

D. The time it takes for the isotope in a sample to decrease by a quarter

10.	Which radiation is deflected more by electric and magnetic fields?

A. Alpha

B. Beta

C. Gamma

D. None are deflected