Exam Elementary Physics Module 4

module 4 Question 1 1 out of 1 points Correct What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km? Selected Answer: Correct 1 Hz Answers: more than 1 Hz less than 1 Hz Correct 1 Hz Question 2 1 out of 1 points Correct In the Doppler effect it is important to distinguish between Selected Answer: Correct frequency and speed. Answers: speed and velocity. speed and acceleration. Correct frequency and speed. distance and displacement. Question 3 1 out of 1 points Correct Refraction causes the bottom of a swimming pool to appear Selected Answer: Correct closer to the surface than it actually is. Answers: Correct closer to the surface than it actually is. farther down than it actually is. neither of these Question 4 1 out of 1 points Correct The sky is blue because air molecules in the sky act as tiny Selected Answer: Correct optical tuning forks that scatter blue light. Answers: Correct optical tuning forks that scatter blue light. prisms. sources of white light. mirrors which reflect only blue light. none of the above Question 5 0 out of 1 points Incorrect When an elevator is accelerating upward, the frequency of a pendulum inside Selected Answer: Incorrect decreases. Answers: Correct increases. doesn't change. decreases. Question 6 1 out of 1 points Correct Both a transverse wave and a longitudinal wave have Selected Answer: Correct all of the above Answers: amplitude. frequency. speed. wavelength. Correct all of the above Question 7 1 out of 1 points Correct If three primary colors of light shine on a white wall and produce a white spot, the primaries must be Selected Answer: Correct additive. Answers: subtractive. multiplicative. Correct additive. divisive. Question 8 1 out of 1 points Correct The atmosphere of Jupiter is more than 1000 km thick. From Jupiter's surface, the Sun at noon would appear Selected Answer: Correct none of the above Answers: not at all. faintly white. white. Correct none of the above Question 9 1 out of 1 points Correct Your friend says that any radio wave travels appreciably faster than any sound wave. Selected Answer: Correct agree with your friend unconditionally Answers: Correct agree with your friend unconditionally agree with your friend for most common cases find a new friend disagree with your friend Question 10 1 out of 1 points Correct When a colored light in air shines on water and is refracted, its frequency Selected Answer: Correct remains unchanged. Answers: increases. Correct remains unchanged. decreases. Question 11 1 out of 1 points Correct In the periphery of our vision, we are Selected Answer: Correct sensitive to movement, but cannot see color. Answers: sensitive to both movement and color. Correct sensitive to movement, but cannot see color. insensitive to color and movement. more sensitive to low frequencies than high ones. none of the above Question 12 1 out of 1 points Correct A mixture of red and green pigments appears Selected Answer: Correct muddy- brown. Answers: blue. magenta. orange. yellow. Correct muddy-brown. Question 13 1 out of 1 points Correct When an astronaut on the Moon experiences a solar eclipse, observers on Earth see Selected Answer: Correct a lunar eclipse. Answers: a solar eclipse. no eclipse at all. Correct a lunar eclipse. Question 14 1 out of 1 points Correct While Earth is experiencing a total solar eclipse, an observer on the side of the Moon facing Earth would see Selected Answer: Correct a dark area moving across the face of Earth. Answers: Earth disappear from the sky. Earth dim and turn reddish. Correct a dark area moving across the face of Earth. nothing unusual. Question 15 1 out of 1 points Correct A pinhole cameras has no lens. The tiny pinhole opening insures that rays of light from different parts of an object Selected Answer: Correct don't overlap. Answers: Correct don't overlap. overlap. bend to a focus. Question 16 1 out of 1 points Correct When light is refracted, there is a change in its Selected Answer: Correct wavelength. Answers: frequency. Correct wavelength. both of these neither of these Question 17 1 out of 1 points Correct A red shift for light indicates that the light source is moving Selected Answer: Correct away from you. Answers: Correct away from you. toward you. both of these neither of these Question 18 0 out of 1 points Incorrect Which interacts more with high- frequency light? Selected Answer: Incorrect both the same Answers: Correct small particles large particles both the same Question 19 1 out of 1 points Correct Diffuse reflection occurs when the size of surface irregularities is Selected Answer: Correct large compared to the wavelength of the light used. Answers: microscopic. small compared to the wavelength of the light used. Correct large compared to the wavelength of the light used. Question 20 1 out of 1 points Correct An aircraft that flies faster than the speed of sound is said to be Selected Answer: Correct supersonic. Answers: impossible. Correct supersonic. subsonic. none of the above Question 21 1 out of 1 points Correct The greenish blue of water is evidence for the Selected Answer: Correct absorption of red light. Answers: reflection of greenish-blue light. interaction between green and blue frequencies of light. reflection of red light. absorption of greenish-blue light. Correct absorption of red light. Question 22 1 out of 1 points Correct In which material does light travel fastest? Selected Answer: Correct air Answers: Correct air same for all water glass plastic Question 23 1 out of 1 points Correct When spearing a fish with a regular spear, to compensate for refraction, throw your spear Selected Answer: Correct below the sighted fish. Answers: directly at the sighted fish. Correct below the sighted fish. above the sighted fish. Question 24 1 out of 1 points Correct A fishing- boat captain returns to port saying, "It's rough out there with waves that are 4 meters high." He is probably talking of waves of amplitude Selected Answer: Correct 2 m. Answers: 4 m. 3 m. 1 m. Correct 2 m. Question 25 0 out of 1 points Incorrect The part of the visible spectrum most absorbed by water is Selected Answer: Incorrect infrared. Answers: cyan. infrared. Correct red. all about equally. Question 26 1 out of 1 points Correct A banana will appear black when illuminated with Selected Answer: Correct blue light. Answers: Correct blue light. black light. red light. green light. Question 27 1 out of 1 points Correct Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is Selected Answer: Correct 3.0 m. Answers: Correct 3.0 m. 300 m. 0.3 m. 30 m. none of the above Question 28 1 out of 1 points Correct A blueberry will look black when illuminated with Selected Answer: Correct yellow light. Answers: Correct yellow light. red light. cyan light. magenta light. none of the above Question 29 1 out of 1 points Correct The type of lens that brings parallel light rays together is a Selected Answer: Correct converging lens. Answers: combination of converging-diverging lens. diverging lens. Correct converging lens. Question 30 1 out of 1 points Correct A white boat sunk in water where sunlight is dim appears Selected Answer: Correct cyan. Answers: Correct cyan. yellow. no color–black. red. Question 31 1 out of 1 points Correct Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass? Selected Answer: Correct 81% Answers: 85% 89% 80% Correct 81% 90% Question 32 1 out of 1 points Correct A floating leaf oscillates up and down two complete cycles in one second as a 10- meter long water wave passes by. What is the wave's speed? Selected Answer: Correct 20 m/s Answers: 2 m/s Correct 20 m/s more than 40 m/s 40 m/s 10 m/s Question 33 1 out of 1 points Correct When visible light is incident upon clear glass, atoms in the glass Selected Answer: Correct are forced into vibration. Answers: resonate. convert the light energy into internal energy. Correct are forced into vibration. Question 34 1 out of 1 points Correct If a fish looks upward at 45° to a pond's water's surface, it will see Selected Answer: Correct the sky and possibly some tall surroundings. Answers: the pond's bottom. only the water's surface. Correct the sky and possibly some tall surroundings. none of the above Question 35 1 out of 1 points Correct Fermat's principle applies to Selected Answer: Correct both of these Answers: reflection. refraction. Correct both of these neither of these Question 36 1 out of 1 points Correct If you walk towards a mirror at a certain speed, the relative speed between you and your image is Selected Answer: Correct twice your speed. Answers: Correct twice your speed. your speed. half your speed. none of the above Question 37 1 out of 1 points Correct Light travels fastest in Selected Answer: Correct a vacuum. Answers: cool air. warm air. Correct a vacuum. Question 38 1 out of 1 points Correct A single raindrop illuminated by sunshine disperses Selected Answer: Correct all the colors of the rainbow. Answers: a single color. Correct all the colors of the rainbow. mainly light of mid-frequency colors. Question 39 1 out of 1 points Correct An object that completes 20 vibrations in 10 seconds has a frequency of Selected Answer: Correct 2 hertz. Answers: 200 hertz. 1 hertz. Correct 2 hertz. 0.5 hertz. Question 40 1 out of 1 points Correct A fast- moving ball is more easily seen if it is Selected Answer: Correct yellow- green. Answers: violet. Correct yellow-green. green-blue. red. orange.