If the temperature of Sun is doubled, heat energy reached on earth become:
Correct answer: B. Sixteen Times
- A. Three Times
- B. Sixteen Times
- C. Four Times
- D. Same
Explanation
The energy radiated per unit area by a black body is governed by Stefan's law. The energy radiated per unit area is governed by Stefan's law, which states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time is directly proportional to the fourth power of the black body's thermodynamic temperature T. E∝T4 So let E1 be the energy at temperature T and be E2 the energy at temperature 2T. Then the ratio of E2 to E1 is, E2/E1= T14/T14=(2T)4/T4) E2=16E1 So the rate of energy received increases by 16 times.
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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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