A light ray in water passes into air. The angle of incidence in the water is 40°. What is the angle of refraction in air if the index of refraction of water is 1.33?
A) 59°
B) 0.59°
C) 40°
D) 1.33°
E) 29°
A
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During the first year of its operation, only 20% of the projects scheduled for the Hubble Space Telescope involved taking images and pictures of celestial objects. The remaining 80% of the telescope's time was devoted to observing the spectrum of celestial objects. Why do astronomers place such a high emphasis on looking at the spectrum of a celestial object rather than an image? Explain
What will be an ideal response?
Kepler's first law of planetary motion implies that
a. the planets move at a constant speed at all points in their orbits. b. the planets all move around Earth in elliptical orbits. c. uniform circular motion is adequate to describe the motion of all planets. d. planets move in elliptical orbits around the Sun.
Homogeneity and isotropy, taken as assumptions regarding the structure and evolution of the universe, are known as
A) the cosmological principle. B) Hubble's law. C) Wien's law. D) the Grand Unified Theory. E) Olbers's paradox.
A packet, or quantum of light or any other type of electromagnetic radiation is called
a) an energy level. b) a photon. c) an excited state. d) a discrete bundle.