The binding energy of deuteron is 2.2 MeV and that of from Class Physics Nuclei
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    NEET Physics : Nuclei

    Multiple Choice Questions

    21.

    Two radioactive materials X1 and X2 have decay constant 5 λ respectively. If initially, they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be 1/e after a time

    • λ

    • λ/2

    • 1/4λ

    • 1/4λ

    Answer
    • 22.

    Monochromatic light of frequency 6.0 x 1014 Hz is produced by a laser. The power emitted is 2 x 10-3 W The number of photons emitted, on the average, by the source per second is:

    • 5 x 1015

    • 5 x 106

    • 5 x 1017

    • 5 x 1017

    Answer
    • 23.

    Two nuclei have their mass number in the ratio of 1:3. The ratio of their nuclear densities would be

    • 1:3

    • 3:1

    • (3)1/3 : 1

    • (3)1/3 : 1

    Answer
    • 24.

    The binding energy of deuteron is 2.2 MeV and that of  He presubscript 2 presuperscript 4 is 28 MeV. If two deuterons are fused to form one He presubscript 2 presuperscript 4 then the energy released is

    • 25.8 MeV

    • 23.6 MeV

    • 19.2 MeV

    • 19.2 MeV

    Answer
    • 25.

    Two radioactive substance A and B have decay constants 5λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of a number of nuclei of A to those of B will be open parentheses 1 over straight e close parentheses squared after a time interval:

    • 1/ 4λ

    • 4λ

    • 2λ

    • 1/2λ

    Answer
    • 26.

    If M (A, Z), MP and Mn denote the masses of the nucleus straight X presubscript straight Z presuperscript straight A  proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its binding energy  in MeV, then


    • M (A,Z) = ZMp + (A-Z)Mn - BE/c2

    • M (A,Z) = ZMp + (A-Z)Mn + BE

    • M (A,Z) = ZMp + (A-Z)Mn - BF

    • M (A,Z) = ZMp + (A-Z)Mn - BF

    Answer
    • 27.

    The number of beta particles emitted by radioactive substance is twice the number  of alpha particle emitted by it. The resulting daughter is an 

    • isobar of parent

    • isomer of parent

    • isotone of parent

    • isotone of parent

    Answer
    • 28.

    In radioactive decay process, the negatively charged emitted beta particles are:

    • the electrons present inside the nucleus

    • the electrons produced as a result  of the decay of neutrons inside the nucleus

    • the electrons produced as a result of collisions between atoms

    • the electrons produced as a result of collisions between atoms

    Answer
    • 29.

    A nucleus has straight X presubscript straight Z presuperscript straight A 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:

    • BE = [M(A,Z)-ZMp - (A-Z)Mn]c2

    • BE = [ZMp + (A-Z)Mn -M(A,Z)]c2

    • BE = [ZMp + AMn - M (A,Z)]c2

    • BE = [ZMp + AMn - M (A,Z)]c2

    Answer
    • 30.

    If the nucleus Al presubscript 13 presuperscript 27 has a nuclear radius of about 3.6 fm, then Te presubscript 52 presuperscript 125 would have its radius approximately as: 

    • 6.0 fm

    • 9.6 fm

    • 12.0 fm

    • 12.0 fm

    Answer
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