Topic Lag Sheet: Radioactivity _________
In the space to the right, draw a labelled diagram
of the Plum Pudding Model of the Atom. (3)
What did JJ Thomson discover that led to the
creation of the Plum Pudding model and why did
this mean Dalton’s model couldn’t be correct? (2)
Rutherford fired Alpha particles at Gold nuclei to discover the nucleus.
Some particles were deflected as shown, what did he learn from this? (1)
What is meant by the term excitation? (1)
A source is placed a short distance from a GM Tube as shown. i) After 30
seconds, 52 counts have been detected. After another 30 seconds, 37 more
counts have been detected. Why should a student not expect these
numbers to be more consistent? (1)
ii) A student is supplied with sheets of paper, aluminium and lead. Describe
how the student can determine the type of source. (3)
The set up below is used to quality control the thickness of paper. What
type of source should be used? Explain why you have chosen this type of
source. (4)
