A nucleus XZA has mass represented by m(A, Z). If mp and mn denote the mass of proton and neutron respectively and BE the binding energy (in MeV), then [2007]

(1) BE = [m(A, Z) - Zmp- (A - Z)mnc2

(2) BE = [Zmp+ (A - Z)mn- m(A,Z)] c2

(3) BE = [Zmp+ Amn- m(A, Z)] c2

(4) BE = m(A, Z) - Zmp- (A, Z)mn

Concept Questions :-

Nuclear binding energy
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The equation XAZYAZ+1 + e0-1+ν¯ is          (UP CPMT 2002)

(1) β-emission                (2) α-emission

(3) e- capture                (4) fission

Concept Questions :-

Types of decay
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Half-lives of two radioactive substances A and B respectively 20 min and 40 min.  Initially, the samples of A and B have equal number of nuclei. After 80 min the ratio of remaining number of A and B nuclei is [1998]

(1) 1 : 16                         (2) 4 : 1

(3) 1 : 4                           (4) 1 : 1

Concept Questions :-

Radioactivity
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Radioactive C2760o is transformed into stable N2860i by emitting two γ-rays of energies [Kerala PET 2010]

(1) 1.33 MeV and 1.17 MeV in succession

(2) 1.17 MeV and 1.33 MeV in succession

(3) 1.37 MeV and 1.13 MeV in succession

(4) 1.17 MeV and 1.13 MeV in succession

Concept Questions :-

Radioactivity
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The volume occupied by an atom is greater than the volume of the nucleus by factor of about [2003]

(1) 1010                (2) 1015                (3) 101                (4) 105

Concept Questions :-

Mass-energy equivalent
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A radioactive nucleus undergoes a series of decay according to the scheme 

AαA1βA2αA3γA4

If the mass number and atomic number of A are 180 and 72 respectively, then what are these number for A4?

(1) 172 and 69                         (2) 174 and 70

(3) 176 and 69                         (4) 176 and 70

Concept Questions :-

Radioactivity
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What fraction of a radioactive material will get disintegrated in a period of two half-lives. 

 

(1) whole                (2) half                (3) one-fourth                (4) three-fourth

Concept Questions :-

Radioactivity
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If the nucleus A1327l has a nuclear radius of about 3.6 fm, then T52125e would have its radius approximately as [2007]

(1) 6.0 fm                   (2) 9.6 fm                 (3) 12.0 fm                   (4) 4.8 fm

Concept Questions :-

Mass-energy equivalent
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After two hours, one-sixteenth of the starting amount of a certain radioactive isotope remained undecayed. The half life of the isotope is [Bihar MEE 1995; Manipal MEE 1995; MP PMT 1997; AFMC 2000, 05; DPMT 2002]

(1) 15 minutes                   (2) 30 minutes

(3) 45 minutes                   (4) 1 hour

Concept Questions :-

Radioactivity
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Atomic weight of boron is 10.81 and it has two isotopes B510 and B511. Then, the ratio of atoms of  B510 and B511 in nature would be 

(1) 19 : 81                   (2) 10 : 11                (3) 15 : 16                 (4) 81 : 19

Concept Questions :-

Mass-energy equivalent
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