Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same speed?
A. I and II
B. I and III
C. II and III
D. III and IV
E. II and IV
Answer: A
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The ecliptic is
a. the centerline of the zodiac. b. the projection of Earth's orbit on the sky. c. the apparent path of the Sun around the sky. d. the centerline of the zodiac, the projection of Earth's orbit on the sky, and the apparent path of the Sun around the sky. e. None of the other choices are correct.
What is the maximum velocity of a photoelectron emitted from a surface with work function 5.22 eV when illuminated by 200-nm ultraviolet light? (melectron = 9.11 × 10^-31 kg, h = 6.63 × 10^-34 J×s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 800,000 m/s c. 653,000 m/s b. 212,000 m/s d. 591,000 m/s
Astronomers believe that the massive object at the center of the Milky Way is a black hole because
A. it is necessary to explain the Galaxy's rotation curve. B. images show an accretion disk surrounding an empty spot. C. gravitational wave measurements indicate a black hole is there. D. observations at X-ray waves, infrared waves, and radio waves limit the size of the object to smaller than 10 AU.
Comets with extremely elliptical orbits, like Hyakutake and Hale-Bopp,
A) come from the Kuiper belt. B) come from the asteroid belt. C) are captured by Jupiter. D) are Trojan comets. E) come from the Oort cloud.