Question: 1. The pi+ meson decays by the process pi+ --> u+ +v. Which of the followings about neutrino is correct? A) It belongs to electron

1. The pi+ meson decays by the process pi+ --> u+ +v. Which of the followings about neutrino is correct?

A) It belongs to electron family and has a lepton number

B) It belongs to muon family and a baryon number

C) It belongs to electron family and has a baryon number

D) It belongs to muon family and has a lepton number

2. A particle is a combination of a down quark and an anti up quark. Is the particle

A) A pi0 meson?

B) A proton?

C) A pi- meson?

D) A pi+ meson?

3. The mass of the isotope 25/11 Na is 24.99u. How many atoms are in a sample of 25/11 Na whose mass is 0.5g?

4. The activity of a 0.50g of sodium isotope 25/11Na at time t = 1000s if its activity at t = 0 is 1.392E20sE-1. You can use the number of atoms from the above problem directly.

5. Calculate the binding energy BE associate with the increase in mass for the reaction: 12/6 C --> 11/6 C + 1/0n. Use these masses

12/6C = 12.0000u

11/6C = 11.011432u

1/0n = 1.008665u

6. One example of a nuclear fission reaction involving slowly moving neutrons is 235/92 U + 1/0n --> 95/42 Mo + 139/57La + 2(1/0n). What is the total energy in MeV released of the reaction? Use these masses:

235/92U = 235.0439u

95/42Mo = 94.9058u

139/57La = 138.9061u

1/0n = 1.0087u

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