Physics - Unit & Dimension Question with Solution | TestHub

PhysicsUnit & DimensionMiscellaneousEasy2 minPYQ_2015
PhysicsEasymultiple choice

Planck' constanth, speed of lightcand gravitational constantGare used to form a unit of lengthLand a unit of massM. Then the correct option(s) is (are)

Options:(select one or more)

Answer:
A, C, D
Solution:

h=ML2T-1
c=LT-1
G=M-1L3T-2
For unit of length
LetLhxcyGz
From principle of homogeneity
LHS=RHS
M0LT0=ML2T-1xLT-1y M-1L3T-2z
M0LT0=Mx-z  L2x+y+3z  T-x-y-2z
Comparing we get
x-z=0
2x+y+3z=1
-x-y-2z=0
Solving we get,x=12, y=-32, z=12
L=hGc3
For unit of mass
LetMhxcyGz
Solving in similar manner as above
We getx=12, y=12, z=-12
M=hcG

Stream:JEE_ADVSubject:PhysicsTopic:Unit & DimensionSubtopic:Miscellaneous
2mℹ️ Source: PYQ_2015

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