(a)[1]
State the name of the particle that has the same mass and charge as a beta-particle.
(b)[2]
State and explain why the metal casing in Fig. 11.1 is used.
(c(i))[2]
State and explain what happens to the number of particles detected in a minute as the radioactive source is moved a few centimetres farther from the source.
(c(ii))[2]
State and explain what happens to the number of particles detected in a minute when the radioactive source is more than a metre away.
(d)[3]
Complete the decay equation for this decay: $^{90}_{38}\text{Sr} \rightarrow {}^{[BLANK]}_{[BLANK]}\text{Y} + {}^{0}_{-1}\beta$
(e(i))[3]
Describe how nuclear fusion is different from nuclear fission.
(e(ii))[2]
Describe the conditions needed for nuclear fusion to occur.