Question

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? (b) What are dimensions of frequency and momentum ​

Answer 1

Linear Momentum = Mass x Velocity

Now
Velocity = Displacement/Time
Velocity = L/T
So
Linear Momentum= M x LT^-1

So Dimensional Formula of Linear Momentum= M1L1T-1
SI unit of Linear Momentum is kg ms-1

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Answer 2

$Frequency = {M}^{0} {L}^{0} {T}^{ - 1} (or) {T}^{-1}$

$Momentum = ML {T}^{ - 1}$

Frequency:

Frequency is the number of occurrences of a repeating event per unit of time.

Momentum:

Momentum is a product of the mass of a particle and its velocity.