Physics And Measurement Question 199

Question: Which of the following product of e,h,μ,G (where μ is the permeability) be taken so that the dimensions of the product are same as that of the speed of light?

Options:

A) he2μ1G0

B) h2eG0μ

C) h0e2G1μ

D) hGe2μ0

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Here v=eahbμcGd .

Taking the dimensions, M0LT1A0=[AT1]a[ML2T1]b[MLT2A2]c[M1L3T2]

There will be four simultaneous equations by equating the dimensions of M, L, T, and A.

These are a-2c=0, a-b-2c solving for a, b, c, and d, we get a=-2, b=1, c=-1, d=0

Thus, v=e2hμ1G0



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