The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing.
B) it was experimental verification of a prediction from the Big Bang theory.
C) it showed the universe must be closed, with more than the critical density here.
D) it established a firm center of the universe.
E) it proved that astronomy at radio wavelengths was possible.
B
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Brewster's Angle: Find Brewster's angle for light in air that is reflected from the top of a water surface. The index of refraction of the water is 1.33.
A. 53.1° B. 36.9° C. 56.3° D. 60.2° E. 90.0°
A star with a large parallax
A) is at a great distance from Earth. B) is moving at a great speed with respect to Earth. C) is at a short distance from Earth. D) is moving at a slow speed with respect to Earth. E) is not moving with respect to Earth.
Underlying the concept of self-induction is
A) Ohm's law. B) Faraday's law. C) Maxwell's law. D) all of these about equally
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?