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NEET PHYSICSEasy

The unit of Planck's constant is:

A

Joule

B

Joule/s

C

Joule/m

D

Joule-s

Step-by-Step Solution

  1. Formula Relation: Planck's constant (hh) relates the energy of a photon (EE) to its frequency (ν\nu) through the equation E=hνE = h\nu .
  2. Dimensional Analysis:
  • Rearranging the formula: h=E/νh = E / \nu.
  • The SI unit of Energy (EE) is the Joule (J).
  • The SI unit of Frequency (ν\nu) is Hertz (Hz) or s−1s^{-1}.
  1. Derivation: Substituting the units, the unit of hh becomes J/s−1=J⋅sJ / s^{-1} = J \cdot s (Joule-second).
  2. Verification: The sources explicitly state the value of Planck's constant as approximately 6.626×10−34 J s6.626 \times 10^{-34} \text{ J s} .
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