What are the two major ways in which extrasolar planets have been discovered?
A) direct imaging with large telescopes
B) measuring changes in the star's brightness when a planet transits
C) measuring the motion of the star due to the planets' gravitational tugs
D) A and B
E) A and C
F) B and C
F
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Why does something weigh less on the Moon than on Earth?
A. The Moon has no atmosphere to apply a downward force on surface objects. B. Earth's gravity pulls in the opposite direction as the Moon's, so the net force is reduced. C. The farther something is from Earth, the lower its weight. D. The Moon's lower mass creates a lower force of gravity at its surface. E. The object's weight is the same on the Moon as it is on Earth.
A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Why does the Doppler method only provide a measure of the minimum mass of a planet?
B) Without a transit observation, the size and therefore density of the planet is unknown. C) We do not know the exact composition of the planet. D) The Doppler shift tells only part of a planet's orbital speed (the part toward and away from the observer). E) We do not have the technology to make a direct image of a planet yet.
The combining of two nuclei to form a larger nucleus with the release of energy is nuclear fusion
Indicate whether the statement is true or false