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(D) The correct option is $D$.Angular momentum is defined as $L = r 	imes p$.The $SI$ unit of angular momentum is $kg \cdot m^2/s$,which is equivalen

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Angular momentum

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(D) The correct option is $D$.Angular momentum is defined as $L = r 	imes p$.The $SI$ unit of angular momentum is $kg \cdot m^2/s$,which is equivalent to $J \cdot s$.According to Bohr's quantization condition,$L = \frac{n h}{2 \pi}$.Since $n$ and $2 \pi$ are dimensionless,the unit of angular momentum $L$ is the same as the unit of Planck's constant $h$,which is $J \cdot s$.

$J s$ is the unit of . . . . . . physical quantity.

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