Physics And Measurement Question 151

Question: Frequency is the function of density $ (\rho ) $ , length $ (a) $ and surface tension $ (T) $ . Then its value is?

[BHU 2003]

Options:

A) $ k{{\rho }^{1/2}}{{a}^{3/2}}\mathbf{/}\sqrt{T} $

B) $ k{{\rho }^{3/2}}{{a}^{3/2}}/\sqrt{T} $

C) $ k{{\rho }^{1/2}}{{a}^{3/2}}/{{T}^{3/4}} $

D) $ k{{\rho }^{1/2}}{{a}^{1/2}}/{{T}^{3/2}} $

Show Answer

Answer:

Correct Answer: A

Solution:

Let $ n=k{{\rho }^{a}}a^{b}T^{c} $

where $ [\rho ]=[M{{L}^{-3}}],\ [a]=[L] $

and $ [T]=[M{{T}^{-2}}] $

Comparing both sides, we get $ a=\frac{1}{2},b=\frac{3}{2} $

and $ c=\frac{-1}{2} $

$ \eta =\frac{k{{\rho }^{1/2}}{{a}^{3/2}}}{\sqrt{T}} $



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