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Flashcards in Topic 4 Deck (39)
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1

A BETA particle has CHARGE of…

-1

2

The RATIO of the net DECLINE in radioactive emission of a substance after X number of half-lives is EQUAL to…

2ˣ (where x is the number of half-lives)

3

in balancing NUCLEAR EQUATIONS, which of these is most accurate?

BOTH relative mass AND charge values on both sides have to have the same total

4

The emission of GAMMA rays…

causes NO change on the MASS or CHARGE of the nucleus

5

When nuclear decay takes place, often there is a CONVERSION of MASS to ENERGY. This energy is typically…

EMITTED as GAMMA radiation

6

The TIME taken for a RADIOISOTOPE to DECAY completely is…

impossible to predict

7

The number of ELECTRONS is equal to the ---(1)--- for an ---(2)---.

 1: proton number; 2: atom

8

In balancing NUCLEAR EQUATIONS, which of these is most accurate?

BOTH relative mass AND charge values on both sides have to have the same total

9

Some radioactive materials emit radiation all the time. What kind of radiation do they emit?

gamma rays

10

A radioactive material can be dangerous because of both CONTAMINATION and IRRADIATION. Which of these can be dangerous to humans, animals and other living things?

irradiation

contamination

11

When an atom's nucleus emits a BETA PARTICLE, its CHARGE…

increases (+1)

12

A radioisotope with a HALF-LIFE of 1 WEEK will…

have a QUARTER of its ACTIVITY in 2 WEEKS

13

Some nuclei are unstable and may emit…

protons

14

The PRODUCTS of nuclear FISSION are…

radioactive

15

The emission of GAMMA rays…

causes NO change on the MASS or CHARGE of the nucleus

16

Which of these will STOP an ALPHA PARTICLE?

smoke particles

17

An increased exposure to radiation would --- the risk of sickness or tumours.

increase

18

The emission of DIFFERENT types of ---(1)--- may cause a ---(2)--- of the nucleus.

1: nuclear radiation; 2: change in the MASS and/or CHARGE

19

The structure of an atom consists of a NUCLEUS containing ---(1)--- and a SHELL (or SHELLS) of ---(2)---.

The structure of an atom consists of a NUCLEUS containing ---(1)--- and a SHELL (or SHELLS) of ---(2)---.

20

Some nuclei are unstable and may emit…

a neutron

21

What Was Ernest Rutherford's Contribution To Science?

He showed that the atom was made up of a tiny nucleus surrounded by electrons

22

A BETA particle (β)…

is a high speed ELECTRON ejected from the nucleus as a neutron turns into a proton

23

When an atom's nucleus emits an ALPHA PARTICLE, its MASS number…

stays the same

24

When nuclear decay takes place, often there is a CONVERSION of MASS to ENERGY. This energy is typically…

EMITTED as GAMMA radiation

25

The emission of GAMMA rays…

causes NO change on the MASS or CHARGE of the nucleus

26

Approximately how far will an ALPHA particle travel through AIR on average?

6cm

27

What (with reference to radioactivity) is meant by the word IRRADIATION?

Exposure to radioactive materials

28

The structure of an atom consists of a NUCLEUS containing ---(1)--- and a SHELL (or SHELLS) of ---(2)---.

1: positive PROTONS and uncharged NEUTRONS; 2: negative ELECTRONS (only)

29

A nuclear REACTOR produces energy through ---(1)--- by a ---(2)--- chain reaction.

1: nuclear FISSION; 2: controlled

30

FISSION is when an atom's NUCLEUS…

SPLITS into TWO OR MORE smaller parts