Variable stars are ones whose ________ changes over time
Fill in the blank(s) with correct word
luminosity
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How will high tides differ from their average values when the Moon and the Sun are 90 degrees from each other in the sky?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon and the Sun are 90 degrees from each other in the sky.
The major processes that heat the interiors of the terrestrial worlds are
A) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat of accretion; (3 ) heat that came from the gravitational potential energy of incoming planetesimals. B) (1 ) Heat of accretion; (2 ) heat from convection; (3 ) heat from thermal radiation. C) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat deposited as the planets underwent differentiation; (3 ) heat released by radioactive decay. D) (1 ) Volcanism; (2 ) tectonics; (3 ) erosion.
The web's ______ advantage allows for data and resource sharing that enables communication with a website.
A. currency B. connectivity C. interactivity D. delivery
A 3.10-eV electron is incident on a 0.40-nm barrier that is 5.67 eV high. What is the probability that this electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 1.4 × 10-3 B) 9.0 × 10-4 C) 1.0 × 10-3 D) 1.5 × 10-3 E) 1.2 × 10-3