What is a fusion reaction?

Copy and complete the following nuclear equations by filling in the correct values of atomic and mass numbers for $P_{1,} P_2$ and $P_3$.

${{}_{92}P}^{238} \stackrel{\alpha }{\to }$$P_1 \stackrel{\beta }{\to }$$P_2 \stackrel{\beta }{\to }$$P_3.$

Draw a cathode ray tube consisting of a heater, a cathode, a cylindrical anode and a defecting system. Show how you will connect a low tension battery of $6 \mathrm{V}$ and a high tension battery of $1000 \mathrm{V}$to the cathodes of the tube.

See the figure. Copy and complete the following diagram by showing and labelling the paths of alpha, beta and gamma radiations in an electric field. Name the radiations which have the least penetrating power.