Planck's constant has the dimension of:
Correct answer: D. Angular momentum
- A. Energy
- B. Work
- C. Linear momentum
- D. Angular momentum
Explanation
The dimension of angular momentum is M1L2T-1. This option is correct oneAngular momentum has the formula as π π L = nh / 2 π ,where is the Planck's constant. π π nh / 2 π is a constant and can be neglected during dimension calculation. Hence, Angular momentum has the same dimension as of Planck's constant
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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