Radioactivity * Flashcards Preview

Physics - AQA A Level > Radioactivity * > Flashcards

Flashcards in Radioactivity * Deck (13):
1

Geiger tube

Sealed tube with low pressure argon gas
When a particle of ionising radiation causing a voltage pulse

2

Inverse square Law

I = k/r²

3

Half life

Time taken for its mass to half

4

Activity of a radioactive isotope

A, is the number of nuclei that disintegrate per second
(Bq)
A = λN

5

Power of a radioactive source

= AE
A activity
E energy per second

6

Number of radioactive particles remaining

N = N₀e^(-λt)

7

Decay constant, λ

Probability of an individual nucleus decaying each second

8

Relationship between half life and the decay constant

Half life = ln2 / λ

9

Carbon dating

Testing for carbon-14
Which is formed by cosmic rays and enters the plant cycle

10

Argon dating

Argon-40 is formed by K decay

11

Uses of radioactivity

Engine wear
Thickness monitoring
Power sources

12

N-Z graph

Stable on the centre swoop

13

Metastable state

Long-lived excited state