Value of Plank's constant is equal to:

6.625 \times 10^{- 34}

J. sec.

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6.25 \times 10^{- 34}

J. sec.

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662.5 \times 10^{- 34}

J. sec.

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None of these

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Solution

The correct option is A $6.625 \times 10^{- 34}$ J. sec.
The Planck's constant is named after the physicist Max Planck. It links the frequency of the electromagnetic wave of a photon to its amount of energy.
$E = h v$
$h \to$ planck's constant $= 6.625 \times 10^{- 34} J . s e c .$

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