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Q. The unit of Planck's constant $h$ is that of

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

Planck constant $h=\frac{E}{v}$
Unit of $h=\frac{\text { unit of } E}{\text { unit of } v}=\frac{\text { Joule }}{\text { per sec }}=J_{-s}$
Unit of angular momentum $J=I \omega m r^{2} \omega=k g m^{2} / sec =J_{-s}$
Thus, unit of $h=$ unit of $J$