Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter.
B) They have more surface area than main-sequence stars of the same temperature.
C) They have very low luminosities because of their big size.
D) Red dwarfs are giant stars that are hot and have high luminosities.
B
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Indicate whether the statement is true or false
Because of Heisenberg's Uncertainty Principle, the velocity of a particle is known least precisely when the length of the wave packet representing the particle is
a. < 10?15 m. b. < 10?10 m. c. of the order of 1.00 m. d. >10 m. e. the length of a plane wave (infinite)
Define absorption and emission lines
What will be an ideal response?
At a temperature of 1090°C (2000°F), the superalloys with the highest strength in a 1000-hour stress rupture test are
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