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# Physics Exam test 2

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70. The colored dots that make up the color on a TV screen are (red), (green), and (blue). These are the (additive) primary colors.
71. Atmospheric refraction makes the daylight hours a bit
longer
72. The secondary rainbow is dimmer than the primary rainbow because
a. Of an extra reflection and refraction in the drops
73. The cross and X pictures shown in class were an example of pre-thinking by the retina compensating for
the blind spot
74. Good binoculars use prisms to redirect light through the process of
a. Total internal reflection
75. A beam of light travels fastest in
air
76. What is the frequency of an electromagnetic wave that has a wavelength of 300 m?
???
77. When a light ray passes, at a non-90 degree angle, from air into water, it
a. Bends toward the normal
78. The sensation of color is seen when light falls on the eye's
cones
79. In general, women have somewhat better (color vision), while men have somewhat better (visual activity).
a. Color vision; visual acuity
80. Light will almost always travel from one place to another along a path of least
time
81. Which of the following series of electromagnetic waves are listed in order of decreasing wavelength?
a. Radio, infrared, visible, ultraviolet, gamma ray
82. The critical angle for water is about
a. 48 degrees
83. The source of all electromagnetic waves is
a. Vibrating electric charges
84. Most of the waves in the electromagnetic spectrum are
invisible
85. For the same wattage, which lamp provides the most light for nighttime viewing?
a. Sodium vapor lamp
86. As you face a plane mirror on the east wall of your room, you raise your north hand. Your image raises
a. Its north hand
87. When white light goes from air into water, the color that refracts the least is
red
88. In the periphery of our vision, we are
a. Sensitive to movement, but cannot see color
89. Your image in a plane mirror is
virtual
90. The Earth's atmosphere is transparent to most waves in the
a. Visible part of the spectrum
91. How far does light travel through the vacuum of space in one second?
a. 300,000 km
92. When looking straight ahead at a primary rainbow, you see violet light from a given raindrop. To see red light in the rainbow, you will need to look
a. At a raindrop higher in the sky
93. The sun is more likely to appear red at sunset than in the middle of the day as a result of the
a. Longer path of air through which sunlight travels
94. Compared to its average speed in air, the average speed of a beam of light in glass is
less
95. It would be very hard to see a tennis ball on the grass courts of Wimbledon if the courts were illuminated with
a. Yellow light
96. The complementary color of red is
cyan
97. When visible light is incident upon clear glass, atoms in the glass
a. Are forced into vibration and then re-emit the light
98. The main difference between a radio wave and a light wave is its
intensity
99. The sky is blue because air molecules in the sky act as tiny
a. Resonators which scatter blue light
100. A mixture of cyan and magenta pigments appears
blue
101. The image of the "infinitely-far-away" sun produced by a converging lens appears
a. At the focal point
102. The law of reflection holds for
a. Curved mirrors
b. Plane mirrors
103. What is the wavelength of an electromagnetic wave that has a frequency of 3000 hertz
a. 100 km
104. When ultraviolet light is incident upon glass, atoms in the glass
resonate
105. Color is seen by
a. The cones in the eye
106. A mixture of magenta and yellow pigments appears
red
107. Distant dark colored hills appear blue because that is the color of the
a. Atmosphere between the observer and the hill
108. When a light ray passes, at a non-90 degree angle, from glass into water, it
a. Bends away from the normal
109. The inversion of your image in a plane mirror is actually an inversion of
a. Front - back
110. The type of lens that spreads parallel light is
a. Diverging lens
111. A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses would be the
a. Sunglasses
112. When looking straight at a rainbow, you see red light from a given raindrop. To see violet light in the rainbow, you will need to look
a. At a raindrop lower in the sky
113. Fiber optic communications primarily depend on
a. Total internal reflection
114. The bending of light as it refracts actually
a. Shortens the time of travel
115. Sunlight is most intense in which portion of the EM spectrum?
a. Yellow-green
116. The main difference between a radio wave and a light wave is its
a. Wavelength
117. You can get a sunburn
a. Through cloud cover
118. The complementary color of yellow is
a. Blue
119. Different colors are dispersed by a prism because different colors in the prism have different
a. Speeds
120. When a light ray passes, at a non-90 degree angle, from water into glass, it
a. Bends toward the normal
121. Refraction results from differences in light's
a. Speed
122. The critical angle for a transparent material is the angle at and beyond which all light within the material is
a. Reflected
123. Electromagnetic waves consist of
a. Oscillating electric and magnetic fields
124. Which of these electromagnetic waves has the shortest wavelength?
x-rays
125. Colors of ink used for printing are (magenta), (cyan), and (yellow). These are the (subtractive) primary colors.
a. Magenta, cyan, yellow; subtractive
126. A blueberry stain will be more noticeable when it is illuminated by the same intensity of
a. Fluorescent lighting
127. When white light goes from air into a glass prism, the color that refracts the most is
a. Violet
128. Red-hot and blue-hot stars appear white to the eye because
a. They are too dim to fire the cones
129. A whitish sky is evidence that the atmosphere contains
a. Predominately large particles
130. Which of the following can be projected onto a viewing screen?
a. A real image
131. A diver shines light up to the surface of a smooth pond at a 25-degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of
a. 25 degrees
132. A mirage occurs for road surfaces that are
warm
133. A mixture of cyan and yellow pigments appears
green
134. What is the frequency of an electromagnetic wave that has a wavelength of 300 km?
a. 1000 Hz