Gold atom has mass of 3.3 * 10^-25 kg and is at rest. It emits an alpha particle of mass 6.6 * 10^-27 kg. As the alpha particle is emitted, teh gold atom becomes an iridium isotope (assume this mass is difference of mass of gold atom adn that of the alpha particle). Alpha particle has speed of 3.4*10^6 m/s.
Find the speed of the iridium isotope after emission process.