First slide

Physical quantities and units

Question

The dimensions of the quantities in one (or more) of the following pairs are the same.
Identify the pair ( $s$ ).

Easy

A

Torque and work
B

Angular momentum and work
C

Energy and Young's modulus
D

Light year and time

Solution

Torque and work both have the dimensions
$[{ML}^{2} T^{- 2}]$
Light year and wavelength both have the dimensions of length, $i.e. [L] .$

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