Thin Films: Light in a frozen block of ice reflects off the ice-air interface at the surface of the block. What phase shift does it undergo?
A. 0°
B. 90°
C. 180°
D. 270°
E. It does not undergo any phase shift.
Answer: A
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Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers
The huge, dark, almost spherical regions between the superclusters of galaxies are called ________
Fill in the blank(s) with correct word
Which of the following is a particle of light?
A) quark B) neutron C) proton D) electron E) photon
Equal currents of magnitude I travel out of the page in wire M and into the page in wire N. Eight directions are indicated by letters A through H.
The direction of the magnetic field at point P is
A. A. B. B. C. C. D. D. E. E.