Units & Measurements

NEET Physics · 152 questions · Page 16 of 16 · Click an option or "Show Solution" to reveal answer

Q151

The dimensions of Planck's constant equals to that of

A energy

B momentum

C angular momentum

D power

Correct Answer

Option C

Solution

Plank constant (h) =

{{E\lambda } \over c}

{{\left[ {M{L^2}{T^{ - 2}}} \right]\left[ L \right]} \over {\left[ {L{T^{ - 1}}} \right]}}

= [ML 2 T -1 ] Angular momentum (L) = I $\times$ $\omega$ = [ML 2 ][T -1 ] = [ML 2 T -1 ]

Q152

Which pair do not have equal dimensions ?

A Energy and torque

B Force and impulse

C Angular momentum and Planck constant

D Elastic modulus and pressure.

Correct Answer

Option B

Solution

Dimension of force = [MLT -2 ] Dimension of impulse = [MLT -1 ] So both of them have different dimensions.

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