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  4. The units of Plancks constant are:

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Q. The units of Plancks constant are:

KCETKCET 1997Physical World, Units and Measurements

Solution:

The formula for Planck's constant is
$=\frac{\text { Energy }}{\text { Frequency }}$
Hence, unit of Planck's constant is
$=\frac{\text { Unit of energy }}{\text { Unit of frequency }}$
$=\frac{\text { joule }}{ \sec ^{-1}}$
$= J s$