Why do white dwarf supernovae all have approximately the same maximum luminosity?
What will be an ideal response?
White dwarf supernovae occur when the mass of the white dwarf has just exceeded 1.4 MSun. Since the mass is the same and the entire object–made of degenerate matter–explodes at once, the maximum luminosity is the same.
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Sunspots are hotter than the photosphere
a. True b. False Indicate whether the statement is true or false
The oldest carbon isotope evidence of life indicates that life on Earth arose at least
A) 4.5 billion years ago. B) 3.95 billion years ago. C) 2 billion years ago. D) 542 million years ago. E) 65 million years ago.
Zero Kelvin is also known as ________.
A. thermal equilibrium B. the boiling point of water C. an ideal blackbody D. the freezing point of water E. absolute zero
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions
What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s) A) 162 N/C B) 212 N/C C) 82.1 N/C D) 150 N/C E) 52.9 N/C