P3.2.6 - P3.2.7 Radioactivity 1 & 2 Flashcards Preview

SHHS - Science - P3.2 Turning Points in Physics - Year 9 > P3.2.6 - P3.2.7 Radioactivity 1 & 2 > Flashcards

Flashcards in P3.2.6 - P3.2.7 Radioactivity 1 & 2 Deck (15):
1

Henri Becquerel noticed invisible 'rays' turned his photographic plates dark. Which element did he study that did this? 

Uranium

2

Which element did Marie Curie discover?

Radium

3

What does radium do in the dark?

Glow

4

Who discovered polonium?

Marie and Pierre Curie

5

What did Marie Curie name the invisible rays that were emitted by some materials?

Radiation

6

The radiation given off by radioactive materials can be one fo 3 types. Name these types.

Alpha particles

Beta particles

Gamma rays

7

What does emit mean?

Give off

8

What is an alpha particle?

The nucelus (protons and neutrons) of a helium atom

9

What is a beta particle?

An electron

10

What is gamma radiation?

a wave from the electromagnetic spectrum

11

Which type of radiation is the most dangerous?

Gamma radiation

12

What happens to radioactive elements over time?

They give off less radiation

13

What do we call the time it takes an element to give off half as much radiation per second?

a half-life

14

What are the benefits of radioactive materials?

Medical scanners (checking for cancers)

Destroying tumours (radiotherapy)

Sterilising medical instruments

Sterilising food

 

15

What are the negative aspects of radiactive substances?

They cause cancer

They can cause random mutations in DNA