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Question

The velocity of the waves on the surface of water is proportional to λαρβgy where λ= wave length, ρ= density and g = acceleration due to gravity. Which of the following relation is correct ?

A
α=βγ
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B
β=γα
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C
γ=αβ
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D
α=β=γ
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Solution

The correct option is B γ=αβ
Dimensions of:
Velocity of waves =[LT1]
Wavelength =[L]
Density =[ML3]
g=[LT2]v=[λαρβgγ]

[(LT1)]=[(L)α(ML3)β(LT2)γ][LT1]=[Lα3β+γMβT2γ]
on equating the powers we get,
β=0,γ=12,α=12
Hence, α=γβ

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