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# 28th Emits an Alpha Particle to Reduce to 224ra. Calculate the Kinetic Energy of the Alpha Particle Emitted in the Following Decay: 228 Th → 224 Ra ∗ + α 224 Ra ∗ → 224 Ra + γ ( 217 Kev ) . - Physics

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ConceptRadioactivity Law of Radioactive Decay

#### Question

28Th emits an alpha particle to reduce to 224Ra. Calculate the kinetic energy of the alpha particle emitted in the following decay:

""^228"Th" → ""^224"Ra"^(∗) + alpha

""^224"Ra"^(∗) → ""^224"Ra" + γ (217 "keV").

Atomic mass of 228Th is 228.028726 u, that of 224Ra is 224.020196 u and that of  ""_2^4H is 4.00260 u.

(Use Mass of proton mp = 1.007276 u, Mass of ""_1^1"H" atom = 1.007825 u, Mass of neutron mn = 1.008665 u, Mass of electron = 0.0005486 u ≈ 511 keV/c2,1 u = 931 MeV/c2.)

#### Solution

Given:-

Atomic mass of 228Th, m(228Th) = 228.028726 u

Atomic mass of 224Ra, m(224Ra) = 224.020196 u

Atomic mass of ""_2^4H, m(""_2^4H) = 4.00260  "u"

Mass of 224Ra = 224.020196 × 931 + 0.217 MeV = 208563.0195 MeV

Kinetic energy of alpha particle, K = [m(""^228"Th") - [m(""^224"Ra") + m(""_2^4"H")]]c^2

= (228.028726 × 931) − [(208563.0195 + 4.00260 × 931]

= 5.30383 MeV = 5.304 MeV

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Solution 28th Emits an Alpha Particle to Reduce to 224ra. Calculate the Kinetic Energy of the Alpha Particle Emitted in the Following Decay: 228 Th → 224 Ra ∗ + α 224 Ra ∗ → 224 Ra + γ ( 217 Kev ) . Concept: Radioactivity - Law of Radioactive Decay.
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