A Levels Physics

The graph of neutron number against proton number represents a sequence of radioactive
decays.
nucleus X
134-
neutron
number 133-
132-
131
nucleus Y
130-
129
81
82
83
84 85
proton
number
Nucleus X is at the start of the sequence and, after the decays have occurred, nucleus Y is
formed.
What is emitted during the sequence of decays?
A one a-particle followed by one B-particle
B one a-particle followed by two B-particles
c two a-particles followed by two B-particles
D
two B-particles followed by one a-particle


Particle and Nuclear Physics | 2012 - O/N - 9702/13 | Q40