Platinum wire becomes yellow at a temperature of _ degrees C.
Correct answer: C. 1300
- A. 900
- B. 500
- C. 1300
- D. 1600
Explanation
Platinum wire typically starts to emit a yellowish glow when heated to around 1300 degrees Celsius.
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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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