MCQ
The mass defect per nucleon is called:
- ABinding energy
- BPacking fraction
- CIonisation energy
- DExcitation energy
Explanation:
Nuclear binding energy can be computed from the difference in mass of a nucleus, and the sum of the masses of the number of free neutrons and protons that make up the nucleus. Once this mass difference, called the mass defect or mass deficiency, is known, Einstein's mass-energy equivalence formula can be used to compute the binding energy of any nucleus.
Early nuclear physicists used to refer to computing this value as a "packing fraction" calculation.
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Assertion : In the process of photoelectric emission, all the emitted photoelectrons have the same kinetic energy.
Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
The output of OR gate is 1
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(a) If both inputs are zero |
(b) If either or both inputs are 1 |
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(c) Only if both input are 1 |
(d) If either input is zero |
Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is
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(a) M - Z |
(b) M |
(c) Z |
(d) M + Z |