Physics And Measurement Question 33

Question: If the constant of gravitation (G) , Planck’s constant (h) and the velocity of light (c) be chosen as fundamental units. The dimension of the radius of gyration is

[AMU (Eng.) 1999]

Options:

A) h1/2c3/2G1/2

B) h1/2c3/2G1/2

C) h1/2c3/2G1/2

D) h1/2c3/2G1/2

Show Answer

Answer:

Correct Answer: A

Solution:

Let radius of gyration [k][h]x[c]y[G]z

By substituting the dimension of [k]=[L] , [h]=[ML2T1],[c]=[LT1],[G]=[M1L3T2] and by comparing the power of both sides we can get

x=1/2,y=3/2,z=1/2

So dimension of radius of gyration are [h]1/2[c]3/2[G]1/2



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