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The nucleus of helium contains:
(1)Four protons
(2)Four neutrons
(3)Two neutrons and two protons
(4)Four protons and two electrons
Ans: (3)Two neutrons and two protons
Astigmatism: In this defect the surface of eye is not perfectly spherical. The eye has different focal point in dissimilar planes and image of an object is not focused clearly
‘q' is a path function. Under what situations it will be a state function? Define and illustrate heterogeneous and homogenous systems with examples.
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Why the fringes are in circular form and how does it form?
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