Spherical lenses suffer from
A) both spherical and chromatic aberration.
B) spherical aberration, but not chromatic aberration.
C) neither spherical nor chromatic aberration.
D) chromatic aberration, but not spherical aberration.
A
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What is a quasar?
A) a starlike object that actually represents a bright patch of gas in the Milky Way B) a very large galaxy thought to be formed by the merger of several smaller galaxies, resulting in a quick burst of star formation C) the name given to the largest objects in the Kuiper Belt D) the extremely bright center of a distant galaxy E) another name for very bright stars of spectral type O
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years
Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). What is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are equal numbers of cobalt-60 and strontium-90 nuclei. B) There are more cobalt-60 than strontium-90 nuclei. C) It is not possible to compare numbers of nuclei without knowing the masses of the samples. D) There are more strontium-90 than cobalt-60 nuclei.
A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip
(a) How long did the trip take according to an observer on Earth? (b) How long did the trip take according to an observer on the spaceship?
A 1.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If the initial velocity is 4.00 cm/s and the initial displacement is 0.00 cm, then what is the maximum displacement of the simple harmonic motion?
A. 2.67 cm B. 2.33 cm C. 2.05 cm D. 1.67 cm E. 1.33 cm