NEST (National Entrance Screening Test) Physics: Questions 1 of 47

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» Physics and Measurement » Dimensional Analysis and Its Applications

Appeared in Year: 2007

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Question

The scattering of an electromagnetic wave by a charged particle of charge and mass is described in terms of the ‘Thomson Cross Section’ , which has the dimension of area. On the basis of dimensional analysis, the possible formula for is – [The symbols have the usual meanings. ]

Choices

Choice (4) Response

a.

b.

c.

d.

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Ques. Time s

Answer

a.

Explanation

  • Since, the dimension of ‘Thomson Cross Section’ is same as dimension of area.

  • For other physical quantities, dimensions are given as,

  • For,

  • Dimension of R. H. S. are,

    Therefore choice, is correct.

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