The magnitude of Planck's constant is:
Correct answer: B. 6.63 x 10^-34 Joule-second
- A. 1.6 x 10^-19 Joule-second
- B. 6.63 x 10^-34 Joule-second
- C. 6.63 x 10^-54 Joule-second
- D. None of the above
Explanation
The magnitude of Planck's constant h is approximately 6.626×10−34 joule-sec. The value of Planck's constant is a fundamental constant of nature.
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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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