The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
Correct answer: C. Stephens law
- A. Karl-Weins law
- B. Rayleigh-Jeans law
- C. Stephens law
- D. Plancks
Explanation
The Stefan-Boltzmann law states that the total energy radiated per unit area per unit time is proportional to T^4, where T is the absolute temperature in kelvins. Thus increasing the temperature from T to 2T increases radiation by 2^4 = 16 times. The likely mistake is Planck's law, which describes the distribution of radiation over wavelength rather than simply the total radiation as T^4.
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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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