AnswerKeyPhysics.pdf

Official answer key Lecturer Physics Exam 2021

For Ques 22 correct option is B
Magnetic interaction is responsible for spin - orbit coupling

Q50 correct option is D
N2 - N1 = 3X10^20
Energy of laser pulse = ((N2 - N1) / 2)hv
= (3X10^20/2) X 2X 1.6 X 10^ - 19 J
= 48J

Students who want to raise objection on any question must have a proof of it.Proof should be from a Book.If you have a proof of your Objection then you can whatsapp it at my number 9417665266
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These are the 3 Questions on which objection can be raised

Statement of this question is incorrect

For Q137 correct answer should be C
Cyclic group

Proof of Q137

For this question no option is correct
'a' is missing in Ques statement

Proof of Ques 75

For Q138 no option is correct
All options are wrong

Q127 option A is correct