At what temperature would the peak wavelength of blackbody radiation correspond to electron-positron pair production? This would have been the lowest temperature in the early universe at which this effect was common.(Note that a photon's energy is equal to , the cosmic background at any point in time has a blackbody spectrum that peaks at a wavelength
, and the mass of a single electron or positron is 9.11 *10-31 kg.)
A) 2400 K
B) 420,000 K
C) 2.4 million K
D) 42 million K
E) 2.4 billion K
Correct Answer:
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