Atoms & Nuclear Physics Test

Result

Atoms & Nuclear Physics Test - 1

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Question 1
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In a process, three nuclei of elements Q ( Binding energy = E_Q ) fuse to form one nucleus of element P ( Binding energy = E_p ) with release of energy ‘e’. The correct relation between E_P, E_Q and e will be

A
E_P = 3E_Q + e

B
E_P = 3E_Q – e

C
E_Q = 3E_P + e

D
E_Q = 3E_P – e

Solution

The given reaction can be stated as,
3Q → P + energy (e)
Energy released, e = E_P - 3E_Q
E_P = 3E_Q + e
Question 2
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Statement - 1 : Energy is released in nuclear fission.

Statement - 2 : Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.

A
Both Statement - 1 and Statement - 2 are true and Statement - 2 is the correct explanation of Statement - 1.

B
Both Statement - 1 and Statement - 2 are true and Statement - 2 is not the correct explanation of Statement - 1.

C
Statement – 1 is true but Statement – 2 is false.

D
Statement – 1 is false but Statement – 2 is true.

Solution

Total binding energy of fragment nucleus is more than total binding
energy of parent nucleus. Since binding energy results in decrease of
total energy. Hence there is great decrease in energy fragment nucleus
because energy is released in nuclear fission.
A → B + E
(Parent) (Fragment) (Energy)
Energy of B is decrease but the binding energy of B is increased due to
release of energy from it. So reason supports the assertion.