1. During a ?- decay, a) a neutron is transformed into a proton. b) a proton is

Question

1. During a ?- decay, a) a neutron is transformed into a proton. b) a proton is transformed into a neutron. c) a neutron is ejected. d) a proton is ejected.

2. In a series of fusion reactions, the original mass was 0.10 u more than the mass of the final products. How much energy was given off in the reactions? a) 0.1 Mev b) 10.0 Mev c) 13.6 Mev d) 28 Mev e) 93 MeV

3. If an element of atomic number 15 has an isotope of mass number 32, a) the number of neutrons is 15. b) the number of neutrons is 17. c) the number of neutrons is 32. d) the number of protons is 17. e) the number of nucleons is 15.

4. A 235U absorbs a neutron and undergoes fission into two nuclei and several neutrons. If one the fission products is barium, what is the other? a) bromine b) krypton c) strontium d) yttrium e) none of the above

Explanation / Answer

1. During the beta decay

Ans (a) a neutron is transformed into a proton

Explanation : the neutron looses its negative charged electron (beta particle) and an antinutrino is left with a positive charge.

2. You did not write the problem correctly (I cant understand " 0.10 u")

3. Atomic No = 15 and Isotope of mass No = 32

Ans is (B) the number of neutrons is 17

Because :

Atomic No + Neutron No = Mass No

Neutron no = Mass no - atmoic no = 32 - 15 = 17

4)

Ans (b) Krypton

Because:

n + 235U --> 141 Ba + 92 Krypton + 3 n

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