In 1998, it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration.
b. The universe must be closed.
c. The universe is finite.
d. The amount of dark matter must be greatly less than the amount of normal matter.
e. The universe must be infinitely old.
A
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Single-Slit Diffraction: A beam of light of wavelength 610 nm passes through a slit that is 1.90 µm wide. At what the angle away from the centerline does the first dark fringe occur?
A. 9.35° B. 11.4° C. 12.2° D. 39.9° E. 18.7°
The places where the Sun crosses the equator are called the
A) annalemmas. B) prime meridians. C) zeniths. D) equinoxes. E) solstices.
The radioactive decay of cobalt 56 into iron 56 affects the light curve of a type I supernova about ________ after the initial peak in luminosity
Fill in the blank(s) with correct word
The energy stored in the earth's magnetic field with a strength of 0.5 × 10-4 T in a room 3.0 m by 4.0 m by 2.4 m is
A) 570 mJ. B) 29 mJ C) 10 mJ. D) 100 mJ. E) zero.