Ib Physics Hl Review Packet: Nuclear Physics Worksheet
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14NAME______________________________
IB PHYSICS HL
REVIEW PACKET: NUCLEAR PHYSICS
This question is about nuclear reactions.
1.
(a)
Complete the table below, by placing a tick (
) in the relevant columns, to show how an increase in each of the
following properties affects the rate of decay of a sample of radioactive material.
Effect on rate of decay
Property
increase
decrease
stays the same
temperature of sample
pressure on sample
amount of sample
(2)
226
Radium-226 (
Ra) undergoes natural radioactive decay to disintegrate spontaneously with the emission of an alpha
88
particle (α-particle) to form radon (Rn). The masses of the particles involved in the reaction are
radium:
226.0254 u
radon:
222.0176 u
α-particle:
4.0026 u
(b)
(i)
Complete the nuclear reaction equation below for this reaction.
226
.........
.........
Ra
……
+
Rn
88
.........
.........
(2)
(ii)
Calculate the energy released in the reaction.
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...........................................................................................................................
...........................................................................................................................
(3)
(c)
The radium nucleus was stationary before the reaction.
(i)
Explain, in terms of the momentum of the particles, why the radon nucleus and the α-particle move off in
opposite directions after the reaction.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(3)
v
(ii)
The speed of the radon nucleus after the reaction is v R and that of the α-particle is v α . Show that the ratio
is
v
R
equal to 55.5.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(3)
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