Two plane mirrors make an angle of with each other. A light ray enters the system and is reflected once off of each mirror. Through what angle is the ray turned?
A) 60°
B) 90°
C) 120°
D) 150°
A
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The primary purpose of a telescope is to
A) collect a large amount of light and bring it into focus. B) magnify distant objects. C) separate light into its component wavelengths. D) measure the brightness of stars very accurately. E) make distant objects appear nearby.
In the U.S., AC line voltage oscillates at a frequency of __________
Fill in the blank(s) with correct word
The alpha particle has twice the electric charge of the beta particle but deflects less than the beta in a magnetic field because it
A) moves much slower. B) moves much faster. C) has much more inertia. D) has much less inertia.
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this
instant, and the waves shown arriving at P1 both arrive with amplitude A, the magnitude of the phase angle of each wave at point P1 (in radians) is
a.
0.
b.
?.
c.
2?.
d.
3?.
e.
?/2.