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GCSE Questions: Radioactivity

Q10.

Americium-241 is an isotope of americium.

 

(a) Which of the isotopes given in the table belowis not an isotope of americium?

Give a reason for your answer. [2 marks]

 

Isotope
Mass number
Atomic number
A
243
95
B
243
94
C
242
95

 

(b) The graph below shows how the number of americium-241 nuclei in a sample changes with time.

Calculate the half-life of americium-241

[2 marks]

(Total 4 marks)