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

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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

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Important MCQs on Physics

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