The Doppler method seeks to detect planets by
A) precisely measuring distances to stars.
B) directly detecting the light of planets orbiting stars.
C) measuring small changes in the positions of stars on the sky.
D) precisely measuring the velocities of stars moving toward and away from us.
E) measuring small changes in the apparent brightness of stars.
D) precisely measuring the velocities of stars moving toward and away from us.
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Double-Slit Interference: In a double-slit experiment, it is observed that the distance between adjacent maxima on a remote screen is 1.0 cm. What happens to the distance between adjacent maxima when the slit separation is cut in half?
A. It increases to 2.0 cm. B. It increases to 4.0 cm. C. It decreases to 0.50 cm. D. It decreases to 0.25 cm. E. None of these choices are correct.
The first molecules of RNA were probably made
A) on the surfaces of clays or other minerals B) deep within the earth C) in the atmosphere D) in space and then transported to the Earth in meteorites
A spaceship of mass m1 circles a planet (mass = m2) in an orbit of radius r. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
A. Gm1m2/(2r) B. ?Gm1m2/(3r) C. ?Gm1m2/(4r) D. ?Gm1m2/(6r) E. 3Gm1m2/(4r)
The lithosphere "floats" on the asthenosphere, and the parts of lower density float higher. This state of buoyancy is called
a. specific continuity. b. isostasy. c. the syncline anomaly. d. remanent balance.