Radioactivity

Question 1

What is the first thing you should always do when doing experiments with radiation?

Answer 1

Find the background count

Question 2

Describe the motion of a radioactive substance

Answer 2

Random and spontaneous

Question 3

Equation for calculating rate of decay

Answer 3

Decay constant* the number of nuclei

Question 4

Define radioactive decay

Answer 4

The process of a radioactive object releasing radioactive particles

Question 5

Give the equation for Activity and what each stands for

Answer 5

Decay constant X number of nuclei

Question 6

What is the exponential equation for Activity?

Answer 6

A= A0e^-lamda T

Question 7

Define Half life

Answer 7

The time taken for the number of radioactive nuclei in a sample to halve.

Question 8

What do you plot on x and Y said to find half life?

Answer 8

Count rate against time

Question 9

To calculate the age of an object we need to know:

Answer 9

Original count rate
Half life of radioactive isotopes
Current count rate

Question 10

Who showed that atoms are not the smallest unit of matter?

Answer 10

J.j Thompson