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Flashcards in Radioactivity Deck (56)
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1

Who discovered two types of Radiation

Ernest Rutherford

2

Who were Ernest Rutherford's workers

Hans Geiger and Ernest Marsden

3

What are the three types of radioactivity?

Alpha radiation (α), beta radiation (β) gamma radiation (γ).

4

What is activity?

Activity is the number of decays in 1 second of a source

5

Which type of radiation is the most penetrating?

Gamma radiation.

6

Why is beta radiation dangerous??

Because it has moderate ionising powers and moderate penetrating powers.

7

Which type of radiation cannot be penetrated by paper?

Alpha radiation.

8

What can ionising in a living cell do?

It can damage or kill the cell.

9

Can beta radiation penetrate paper?

Yes

10

Why are some substances radioactive?

Atoms that have an unstable nucleus try to become stable and in the process emit radiation.

11

Name 2 uses of radiation

Any 2 below:1.Treating cancer 2.Sterilising medical instruments 3.Sterilising food4.Detecting brain tumours

12

Where is most of an atom's mass located?

The small, positively charged nucleus.

13

what is 'Half Life'?

Half life is the average time taken for the number of nuclei of the isotope in a sample to half.

14

What did the scientists think the atom was like in 1914?

Plum Pudding.

15

Which type of radiation was stopped by paper?

Alpha radiation

16

What was the name of the Physicist who discovered that alpha and beta radiation is made up of different types of particles?

Ernest Rutherford.

17

What are the 3 conclusions Rutherford made after his scattering experiment?

1. Atoms are made up of empty space

 

2.The nucleus is positively charged therefore it repels the positive alpha particles

 

3.The atom must have a very small dense nucleus in the middle

18

What is a alpha particle made up of?

Two protons , two neutrons

19

Which radiation is the most dangerous in terms of ionising?

alpha

20

Which scientist carried out experiments where we put different materials between the radioactive substance and a detector.

Ernest Rutherford

21

Which of the following are made up of different types of particles? Alpha, beta or gamma

Alpha and bae

22

Which type of radiation is the least ionising?

Gamma.

23

What was the proposed model of the atom before it was discovered called?

The plum pudding model.

24

Define Ionising

When radiation knocks an electron off an atom. This results in very reactive positive atoms.

25

When was the nucleus discovered ?

1914

26

what are the three types of radiation?

Alpha, Beta and Gamma

27

What is the rough range of alpha radiation in the air?

5 cm

28

What is the relative mass of a proton and neutron?

1

29

What is the relative charge of a proton?

1

30

What are the three types of radiation?

Alpha,Beta,Gamma