Physics Dawn of Modern Physics MDCAT 2019
PMDC Verified Question 43 of 52
The value and units of the Plank constant 'h' can be expressed as:
A
\( 6.63 \times 10^{-34} \text{ Js}^{-1} \)
B
\( 6.63 \times 10^{34} \text{ Js} \)
C
\( 6.63 \times 10^{-34} \text{ Js} \)
D
\( 3.63 \times 10^{14} \text{ Js} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( 6.63 \times 10^{-34} \text{ Js} \)
Concept:

Planck's constant is a fundamental physical constant defining the quantum scale, mapping the relationship between energy and frequency.

Formula:

$$ h = \frac{E}{f} $$

Solution:

  • The accepted value is \( 6.626 \times 10^{-34} \) (usually rounded to \( 6.63 \times 10^{-34} \)).


  • The unit is Energy (Joules) divided by Frequency (Hertz, which is \( \text{s}^{-1} \)).


  • Thus, the unit is Joule-seconds (\( \text{J} \cdot \text{s} \)).


Why other options are incorrect:

A positive exponent (\( 10^{34} \)) represents a cosmically massive, incorrect value. \( \text{Js}^{-1} \) represents Joules per second (Watts), which is a unit of power, not action.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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