Which of the following statements is true of L dwarfs?
A) They are cooler than M stars.
B) They are cooler than T dwarfs.
C) They are fainter than T dwarfs.
D) They are brighter than M stars.
A
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_____ is pulverized rock scattered by meteorite impacts on a planetary surface
A) Ejecta B) A magma ocean C) The Maxwell Montes D) Permafrost
The Sun creates its energy by the process of
a. nuclear fission. b. nuclear fusion. c. convection. d. conduction. e. radiation.
The energy of an electron state has an uncertainty of 0.500 eV. What is the minimum uncertainty in the lifetime of the level? ( h = 1.055 × 10-34 J ? s = 6.591 × 10-16 eV ? s, 1 eV = 1.60 × 10-19 J)
A) 1.32 × 10-15 B) 1.32 × 10-8 C) 8.28 × 10-15 D) 8.28 × 10-11 E) 1.32 × 10-11
One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the age of the Earth-based twin brother?
A) 20; 30 B) 30; 50 C) 40; 60 D) 50; 70 E) 70; 90