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.

a. Red, green, blue; additive

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

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