Standing waves are produced by the superposition of two waves with
A. the same amplitude, frequency, and direction of propagation.
B. the same amplitude, frequency, and opposite direction of propagation.
C. the same amplitude, different frequencies, and opposite direction of propagation.
D. the same amplitude, different frequencies, and same direction of propagation.
B. the same amplitude, frequency, and opposite direction of propagation.
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This figure summarizes the geological histories of the terrestrial worlds. Based on this figure, what can you conclude?
A) The most important factor in a planet's geological history is its size. B) The most important factor in a planet's geological history is its distance from the Sun. C) We can trace almost all the key properties of a planet's geology back to the number of impacts it suffered during the heavy bombardment. D) Earth is the only planet in the inner solar system capable of harboring life.
Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth. With g representing, as usual, the free-fall acceleration at the surface of Earth, the free-fall acceleration at the surface of Z-34 is
A) g/3. B) 3g. C) 6g. D) g/9. E) 9g.
Which have more massive supermassive black holes, spiral galaxies like Andromeda or elliptical galaxies like Cygnus A?
A) Both are the same. B) Spirals. C) Ellipticals. D) Neither type of galaxies has supermassiave black holes. E) Supermassive black holes do not exist at all.
Which of these was NOT a telescopic discovery of Galileo?
A) the moons of Saturn B) the craters and mare of the Moon C) sunspots and the rotation of the Sun D) the four largest moons of Jupiter E) the phases of Venus