<prompt> Alpha particle is similar toElectronProtonNeutronHelium nucleus  <response>: Ans: d Helium nucleus Ref: Vasudevan 4th edp 464.Alpha particle consists of 2 protons and 2 neutrons bound together into a particle identical to Helium nucleus He2.Beta particles are high energy, high speed electrons or positrons emitted by radioactive nuclei. Gamma rays are electromagnetic radiation of high frequency.X-rays are low energy photons.Penetration powen-Gamma ray X ray. Beta particle alpha particleIonising and damaging power: -Alpha particle Beta particle X ray Gamma ray 