A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an electrostatic charge of +2. It has low penetrating power and a short range (a few centimeters in air).
The charge of alpha particles is +2. Alpha particle is consisting of two protons and two neutrons bound together, thus having a mass of four units.
Alpha particles are relatively slow and heavy compared with other forms of nuclear radiation. The particles travel at 5 to 7 % of the speed of light or 20,000,000 metres per second and has a mass approximately equivalent to 4 protons.
An Alpha particle is a Helium nucleus consisting of two protons and two neutrons so itscharge is +2e.
The charge-to-mass ratio (Q/m) of an object is, as its name implies, the charge of an object divided by the mass of the same object. This quantity is generally useful only for objects that may be treated as particles.
Final Answer: The charge on an alpha particle is 3.2×10−19 coulombs.
A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an electrostatic charge of +2.
It was the first type of nuclear radiation to be discovered, before beta particles and gamma rays. But because an alpha particle is identical to the nucleus of a helium-4 atom, it is sometimes represented as He2+, that is, a doubly ionized helium-4 atom.
The mass of α−particle is 6.8×10−27kg and its charge is twice the charge of proton, i.e.,3.2×10−19C. The emission of an α− particle reduces the mass of nuclei by 4 units and increases its atomic number by 2. A fusion reaction consists of combining four protons into an α–particle.
Since an alpha particle is a doubly charged helium atom, it has the same mass as that of a doubly charged helium atom which is 4.0015 a.m.u. This corresponds to 6.642×10−24 g.
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