Assertion :The binding energy per nucleon, for nuclei with the atomic mass number A>100, decreases with A. Reason: The nuclear forces are weak for heavier nuclei.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion Binding energy per nucleon decreases with A for nuclei with the atomic mass number A>100 due to weak nuclear forces. It can. be explain as : At short distances, the nuclear force is stronger than the Coulomb force; it can overcome the Coulomb repulsion of protons inside the nucleus. At typical nucleon separation (1.3fm) it is a very strong attractive force (104newtons). Beyond about 1.3fm separation, the force exponentially dies off to zero. However, the Coulomb force between protons has a much larger range and becomes the only significant force between protons when their separation exceeds about (2.5fm,A>100).