X-rays from the Sun's corona
A) are absorbed in Earth's troposphere.
B) are absorbed in Earth's thermosphere.
C) cause meteor showers.
D) break apart ozone in the stratosphere.
E) generally reach Earth's surface.
B) are absorbed in Earth's thermosphere.
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Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
A. conservation of angular momentum B. conservation of linear momentum C. conservation of energy D. the law of universal gravitation E. conservation of mass
Which of the following statements expresses what we mean by a scientific theory?
A) a simple model that explains a wide variety of phenomena and that has survived repeated tests B) an explanation for a physical phenomenon, an explanation that hasn't been tested yet C) an educated guess
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits
At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other? A) 4.5 mm B) 3.0 mm C) 6.0 mm D) 1.5 mm