Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2 . The angle of reflection of that ray from mirror 2 is
a. 0°.
b. 30°.
c. 60°.
d. 90°.
e. 120°.
b
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About how many stars are visible to the naked eye on a clear, dark night away from city lights?
A) a few dozen B) a couple thousand C) several million D) a few hundred billion
You observe a distant galaxy. You find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. What do you conclude?
A) The galaxy is moving away from you. B) The galaxy is moving toward you. C) The galaxy has very weak gravity. D) The galaxy is made purely of hydrogen. E) The composition of the galaxy is changing.
The necessary chemical elements of life should
A) only be found on the Earth and Mars B) be widespread in the solar system but not elsewhere in our Milky Way galaxy C) be widespread throughout the universe D) be widespread in our Milky Way galaxy but not in other galaxies
In simple harmonic motion, the speed is greatest at that point in the cycle when
A) the magnitude of the acceleration is a maximum. B) the displacement is a maximum. C) the magnitude of the acceleration is a minimum. D) the potential energy is a maximum. E) the kinetic energy is a minimum.