Calculate charge to mass ratio of alpha ray
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Explanation:
An Alpha particle is He+2 ion which contains 2 neutrons and 2 protons.
Charge on 1 alpha particle = charge on 2 protons = 2×1.6×10^-19
= 3.2×10^-19 C
Mass of 1alpha particle = Mass of 2 neutrons + Mass of 2 protons
Mass of proton ~ Mass of neutron = 1.67 × 10^-27 kg
Total mass = 4 × 1.67 × 10^-27 kg = 6.6 × 10^-27 kg
Charge / Mass = 3.2×10^-19 C /6.6 × 10^-27 kg
= 4.84 × 10^7
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