What is the wavelength of the longest wavelength light that can be seen with the human eye?
a. 400 nm
b. 4000 nm
c. 7000 nm
d. 700 nm
e. 3×10^8 m
d
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What could explain the darker appearance of moons and rings in the outer solar system?
A) They shine by the diminished light at that great distance from the Sun. B) They are made of small, sooty particles and radiation darkening with loss of volatile bright ices. C) They are composed of basaltic eject from the volcanism on Ariel and Triton. D) They are made of water ice that reflects light much more poorly at the very low temperatures of these moons. E) They are composed of mostly rocky material, like S type asteroids.
The most important advantage of CCDs over film is that
A) they can cover larger areas of the sky than film can. B) they record much more light in a given exposure time. C) they record colors better than film can. D) their images never fade, as film can. E) their images do not have to be developed as film does.
Mass on a Spring: A 0.50-kg object is attached to an ideal spring of spring constant (force constant) 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. At what distance from the equilibrium position are the kinetic energy and potential energy of the system the same?
A. 0.017 m B. 0.029 m C. 0.12 m D. 0.17 m
Mechanization of southern agriculture was responsible for the increase in northern African-American populations
What will be an ideal response?