O\"When an unstable nuclei decays via an alpha decay.theremainis daughter o has
ID: 1997903 • Letter: O
Question
O"When an unstable nuclei decays via an alpha decay.theremainis daughter o has two fewer protons and two fewer neutrons. has two more protons and two more neutrons. O has two fewer protons and the same number of neutrons. has the same number of protons and the two fewer neutrons. None of the above is true. Rework Example 40-2, except now the radiactive sourcehas a half-timeof T1/2 minutes and an initial activity of 3*103 counts/second. Find the counting rate after 12 minutes. counts/sec b All samples of a particular element have the same number of protons, but if they have different numbers of neutrons, they are referred to as diffent O nuclides. hadronic types. None of the above is true. "When two or more nucleons fuse together both the total charge and total mass is unchanged. the total charge may change but the mass is unchanged. the total mass increases. O the total mass decreases. None of the above is true. O The material that surrounds the core of a nuclear reactor to slow down the is referred to as the control rods. the reasonator. the core shield the moderator. None of the above is true. O 'Figure 40-1 shows that in stable nuclides the number of electrons in an atom is equal to the number of protons o the number of protons is greater than the number of neutrons from heavy the number of protons is approximately equal to the number of neutrons tor light nuclei. the number of protons is greater than the number of electroms. None of the above is true. O The Qvalue of a reaction is the number of protons gained or lost during the reaction o the number of neutrons gained or lost during the reaction. O the number of electrons gained or lost during the reaction. o the combined number of neutrons and protons gained or lost during the O None of the above is true.Explanation / Answer
(i) 2 less protons and 2 less neutrons,as alpha particle is Helium nucleus
(ii) more information needed.(what is example 40.2).
(iii) Isotopes
(iv) When Nucleons (proton,neutrons) fuse resulting mass increases: which is binding energy.
the difference b/w mass of nucleus and sum of masses of protons and neutrons is equal to mass defect and this multiplied by c2 gives binding Energy. : c is Speed of Light :3*108m/sec.
(v) The Moderator: help to slow down the fast-moving neutrons to maintain chain reactions.
(vi) No. of protons and neutrons are equal only for light elements/neucleus.
for heavier nucleus:neutrons outnumber protons for higher stability.
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