A lens is designed to work in the visible, near-infrared, and near-ultraviolet. The best resolution of this lens from a diffraction standpoint is
A) in the near-infrared.
B) the same for all wavelengths.
C) in the near-ultraviolet.
D) indeterminate.
E) in the visible.
C
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We should expect galaxies to collide fairly often because
a. they are large with respect to their separation distances. b. galaxies contain large amounts of neutral hydrogen. c. galaxies occur in clusters. d. they are large with respect to their separation distances and galaxies occur in clusters. e. None of the other choices are correct.
Diffraction Gratings: When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A. 336 nm B. 363 nm C. 633 nm D. 752 nm
Based on the given right ascensions and declinations, which of the following stars appears nearest to the south celestial pole?
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
Which of the following methods uses the principle of orbital acceleration to detect planets around another star?
A) measuring a single Doppler shift of a star, one time B) measuring change in the Doppler shifts of a star over the course of many nights C) taking a picture of the planet next to the star D) measuring the change of light of a star as the planet crosses in front of it