Why have so many optical telescopes been built atop Mauna Kea, Hawai'i?
What will be an ideal response?
To avoid light pollution and light scattering caused by water vapor in Earth's atmosphere.
To get above the clouds to capture more light from faint objects in the sky.
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A negatively charged particle is moving in the +x-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which graph gives its position as a function of time correctly? (Its initial position is x = 0 at t = 0.)
A.
B.
C.
D.
E.
Young children that need glasses are rarely prescribed bifocals. Why?
a. They are almost always nearsighted. b. They are almost always farsighted. c. They have considerable accommodation power. d. Parents don't go for the additional expense.
A monochromatic beam of light in air has a wavelength of 427 nm in air. It passes through glass (n = 1.52) and then through carbon disulfide (n = 1.63). What is its wavelength in the carbon disulfide?
a. 262 nm b. 696 nm c. 398 nm d. 458 nm e. 281 nm
Increasing the diameter of a telescope I. increases its light gathering power. II. increases its resolving power. III. increases it magnifying power. IV. increases its chromatic aberration
a. I, II, III, & IV b. I, II, & III c. I, II, & IV d. III & IV e. I & II