Joule-second is the unit of:
Correct answer: D. Planck's constant
- A. Heat
- B. Energy
- C. Power
- D. Planck's constant
Explanation
The joule-second (J·s) is the unit of action or angular momentum. It is often used to express the value of the reduced Planck constant.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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