When a grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 138 nm
B) 183 nm
C) 367 nm
D) 637 nm
C
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What statement below best describes the behavior of light encountering the objective lens of a refracting telescope?
a. All light is absorbed as it travels through a dense, transparent material. b. White light from astronomical objects is emitted by the lens. c. Light rays are focused to form an image after they pass through the lens. d. Light rays are focused to form an image after they reflect off the lens.
While we can't completely rule out a connection between the sunspot cycle and weather cycles on Earth, most scientists doubt there is a significant effect because
A) the Sun's luminosity changes less than about 0.1% between minimum and maximums of the sunspot cycle. B) the Sun is too far away to affect Earth's weather. C) there are no known cycles in weather or climate that last as long as the sunspot cycle. D) sunspots are linked to the Sun's magnetic field, which could not possibly have any effect on Earth.
We observe stars orbiting at distances of 25,000 light-years from the centers of Galaxy X and Galaxy Y. For this orbital distance, stars in Galaxy X have higher orbital speeds than stars in Galaxy Y. What can we conclude?
A) Galaxy X contains more total mass within 25,000 light-years of its center than Galaxy Y. B) Galaxy Y contains more total mass within 25,000 light-years of its center than Galaxy X. C) Galaxy X contains more dark matter than Galaxy Y. D) Galaxy Y contains more dark matter than Galaxy X. E) The stars of Galaxy X are more massive than those of Galaxy Y.
In a Young's double-slit experiment, what happens to the angular separation between the fringes when the wavelength is increased at the same time that the slit separation is decreased?
a. It increases. b. It decreases. c. It stays the same. d. The relative sizes of the changes need to be known before a definite answer can be given.