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NEET PHYSICSUNITS AND MEASUREMENTSEasy

Question

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} .

Exam Context & Concepts Covered

This question aligns with the NEET PHYSICS syllabus, specifically targeting concepts from UNITS AND MEASUREMENTS. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

PHYSICSUNITS AND MEASUREMENTSplancksconstant

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