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15 Apr 2010 21:45:50 IST

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pl anser these questions with explanations. very urgent rates are sure

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pl anser these questions with explanations. very urgent rates are sure

Answer Q-1 and Q-2 based on the information below.
Just like mass and charge, each particle has a quantity called “Lepton Number”. The table below gives charge and Lepton number of some particles. Like charge, lepton number should be conserved in any physical process.
Particle
charge
Lepton number
Proton , p
+e
0
Neutron, n
0
0
Electron, e-
-e
+1
Positron, e+
+e
-1
Neutrino,
0
+1
Antineutrino, bar
0
-1
Q1. The Lepton number of 14C (Z=6, N=8) is

Q-2 Which of the following processes is possible on the basis of conservation laws?
(a) P+e-+ → n (b) p →e+ + (c) p+e- →n + bar (d) p + e- →n +

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dhruv.tara

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18 Apr 2010 12:48:40 IST

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For Carbon, with the above data... Carbon has 6 electrons, 6 protons and 8 neutrons...p -> lp number = 0... n-> lp num = 0... -e-> lp num = -1...this gives carbon a lp number of -6

edison

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30 Jul 2010 10:55:11 IST

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Q-2) Which of the following processes is possible on the basis of conservation laws?

(a) P+e-+ → n etc,

these are beta decays and are not possible as there should be conservation of parity and momentum, thus there is another particle accompanying this what we call neutrino.

In beta + decay there is neutrino and in beta - decay there is simultaneous emission of antinutrino.

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