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The frequency ( u) of an oscillating liquid drop may depend upon radius (r) of the drop, density (ρ) of liquid and the surface tension (s) of the liquid as u=r^aρ^bs^c. The values of a, b and c respectively are

Asked in JEE Main 24th Jan 2nd Shift 2023 · Deriving a relation by dimensional analysis

Answer: (2) (-3/2,-1/2,1/2)

Step-by-step solution

Given: u=[T⁻¹], r=[L], ρ=[ML⁻³], s=[MT⁻²].

Time: -1=-2c, so c=1/2.

Mass: 0=b+c, so b=-1/2.

Length: 0=a-3b, so a=3b=-3/2.

Hence (-3/2,-1/2,1/2).

Why the other options are wrong

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