A hot luminous solid emits a ______________ spectrum, while a hot luminous gas produces a ______ spectrum
Fill in the blank(s) with correct word
continuous, line
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What is the minimum distance of two points on the moon that can be just resolved by the Keck 10. meter telescope in Hawaii (use a wavelength of 600. nm, lunar distance of 380. thousand Km):
(a) if there were no atmosphere? (b) if the atmosphere limits resolution to 0.2 arc-sec?
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to the
A) bottom of the tower. B) middle of the tower. C) top of the tower. D) all the same
A radioactive isotope has a half-life of one week. At the end of two weeks the amount remaining is
1) none, 2) one-eighth, 3) one-quarter, 4) one-half, and at the end of three weeks the amount remaining is 5) none. 6) one-eighth. 7) one-quarter. 8) one-half.