In the form of radioactive decay known as alpha decay, an unstable nucleus emits

ID: 1261793 • Letter: I

Question

In the form of radioactive decay known as alpha decay, an unstable nucleus emits a helium-atom nucleus, which is called an alpha particle. An alpha particle contains two protons and two neutrons, thus having mass m=4u and charge q=2e . Suppose a uranium nucleus with 92 protons decays into thorium, with 90 protons, and an alpha particle. The alpha particle is initially at rest at the surface of the thorium nucleus, which is 15 fm in diameter.

What is the speed of the alpha particle when it is detected in the laboratory? Assume the thorium nucleus remains at rest.

Explanation / Answer

In the form of radioactive decay known as alpha decay, an unstable nucleus emits a helium-atom nucleus, which is called an alpha particle. An alpha particle contains two protons and two neutrons,

the rest masses of the alpha particle and the uranium and the thorium. Work out the missing mass, then convert that into energy...that will be the KE of the alpha particle.

Kf+qVf = Ki+qVi V = KQ/R

e=1.6*10^-19

Kf + 0 = 0 + qVi

1/2MV^2 = q(KQ/R)

R= 1.5*10^-14 meters

K = 8.99*10^9

Q = 90(1.6*10^-19)Coulombs

q = 2e

m = 4u

(1/2)(4u)V^2 = 8630400 m/s

(2u)V^2 = 8630400 m/s

V = 2077.31 m/s

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In the form of radioactive decay known as alpha decay, an unstable nucleus emits

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In the form of radioactive decay known as alpha decay, an unstable nucleus emits

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