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Class XII Physics Atomic Nucleus 2
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Question 1
The mean lives of a radioactive substances are 1620 years and 405 years for α& β emissions respectively. Find out the time during which 3/4th of a sample will decay if it is decaying both by α and βemission.
Question 2
Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is
Question 3
A nucleus of mass M + Δm is at rest and decays into two daughter nuclei of equal mass M/2 each. Speed of light is c. The speed of daughter nuclei is
Question 4
A nucleus of mass M + Δm is at rest and decays into two daughter nuclei of equal mass M/2 each. Speed of light is c. The binding energy per nucleon for the parent nucleus is E1 and that for the daughter nuclei is E2. Then
Question 5
This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.
STATEMENT – 1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
STATEMENT – 2: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.
STATEMENT – 1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
STATEMENT – 2: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.
Question 6
The energy spectrum of β-particles (number N(E) as a function of β-energy E) emitted from a radioactive source is
Question 7
When protons are bombarded on 3Li7 nuclei, then the resultant nuclei is 4Be8 . So the emitted particles will be
Question 8
The half life of 131I is 8 days. Given a sample of 131I at time t = 0, we can assert that
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Mar 18NEET & AIIMS