In which of the following cases can we determine the precise mass and density of an extrasolar planet?
A) We have detected the planet with both the transit and Doppler methods.
B) We have detected the planet with the Doppler method, but not any other method.
C) We have detected the planet with the transit method, but not any other method.
D) We have observed both transits and eclipses of the orbiting planet.
A) We have detected the planet with both the transit and Doppler methods.
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In which of the following energy level transitions for a hydrogen atom is a photon emitted?
a. n = 1 to n = 2 b. n = 3 to n = 2 c. n = 2 to n = 1 d. n = 1 to n = 4 e. n = 4 to n = 3
The central regions of Earth's core are solid because
a. the composition at the center of the core is lower in iron. b. the pressure at the center raises the melting point. c. the magnetic field cannot penetrate into the center of the core. d. convection does not extend all the way to the center of the core. e. Earth initially formed from solid particles in the solar nebula.
The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.
The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.