A. A magnet produces changing electric fields.
B. An electric charge vibrates or accelerates.
C. An electric field produces charged particles.
D. An electric field produces magnetic forces.
2. Electromagnetic waves can travel
A. through a vacuum, empty space, or matter.
B. anywhere as long as they have a medium.
C. only through matter.
D. only through a vacuum or empty space.
3. When the wavelength of an electromagnetic wave increases, its __________ decreases.
A. amplitude
B. volume
C. mass
D. frequency
4. Which of the following is true about electromagnetic waves?
A. Electromagnetic waves travel at different speeds in a vacuum.
B. Electromagnetic waves vary in wavelength and frequency.
C. Electromagnetic waves travel at the same speed.
D. As the wavelength increases, the frequency also increases.
5. How does electromagnetic radiation behave?
A. As a wave and as a stream of particles
B. As a wave
C. As a stream of particles
D. As a wave or as a stream of particles depending on the context
6. All electromagnetic waves travel at __________ when in a vacuum.
A. different speeds
B. the same speed
C. 1,000 meters per second
D. 1,000,000 meters per second
7. Electromagnetic radiation consists of packets of energy called
A. spectra.
B. electrons.
C. protons.
D. photons.
8. Electromagnetic waves can have different __________ and __________.
A. speeds; wavelength
B. frequency; speeds
C. frequency; wavelength
D. speeds; mass
9. The fact that shadows are produced by light is evidence for
A. the wave model and the particle model of light.
B. the wave model of light.
C. the particle model of light.
D. the radiation model of light.
10. You see light reflecting off of a glossy magazine cover because of a phenomenon called
A. refraction.
B. dispersion.
C. diffuse reflection.
D. regular reflection.
11. A stained glass window is an example of a material that scatters light, because it is
A. transparent.
B. translucent.
C. opaque.
D. polarizing.
12. What causes the surface of a road to appear to shimmer on a hot day?
A. Scattering of light
B. Polarization of light
C. Reflection of light
D. Refraction of light
13. When light passes through a prism, _____ causes it to separate into the colors of the rainbow.
A. dispersion
B. reflection
C. polarization
D. diffuse reflection
14. What color of light is produced when all three primary colors are combined in equal amounts?
A. Cyan
B. Magenta
C. White
D. Yellow
15. Which combination of colors will result in green pigment?
A. Cyan and red
B. Yellow and blue
C. Yellow and cyan
D. Cyan and blue
16. Why would a red object appear to be black under a blue light?
A. The red object absorbs the blue light and reflects it back as black light.
B. The red object absorbs all of the black colored light.
C. The red object absorbs all of the red light, causing it to turn black.
D. No red light reaches the red object, so none can be reflected from it.
17. What determines the color of an object?
A. The color of light that strikes the object and what the object is made of.
B. The color of light that strikes the object and what the object weighs.
C. What the object is made of and what the object weighs.
D. The amount of light that strikes the object.
18. What concept explains why the sky appears blue on a sunny day, even though air has no color?
A. Refraction
B. Scattering
C. Polarization
D. Reflection
19. Which sources create light through the movement of electrons?
A. Incandescent, neon, sodium-vapor, and tungsten-halogen
B. Fluorescent and laser
C. Incandescent, fluorescent, and laser
D. sodium-tungsten and neon
20. A fluorescent bulb emits light
A. by causing a phosphor to steadily emit electrons.
B. by causing a phosphor to steadily emit protons.
C. by causing a phosphor to steadily emit photons.
D. by causing a photon to steadily emit phosphors.
21. Which energy source emits light when electrons move through gas inside of glass tubing?
A. Laser
B. Sodium vapor
C. Incandescent
D. Neon
22. What is one benefit of using a fluorescent light source?
A. It uses less energy than other light sources.
B. It provides cleaner white light than other light sources.
C. It emits most of its energy as light.
D. It can produce many different colors of light.
23. Which energy sources use a heated filament to produce light?
A. Incandescent
B. Tungsten-halogen and incandescent
C. Laser and incandescent
D. Incandescent, sodium-vapor, and tungsten-halogenPhysical science please help me.?1. B; 2 A; 3 D; 4 B; 5 D; 6 B; 7 D; 8 A; 9A; 10 c; 11 B; 12 C; 13 A; 14 C; 15 B; 16 D; 17 A; 18 B; 19 B; 20 C; 21 D; 22 C; 23 A; 24 D; 25 A;Physical science please help me.?wtf is this telling me
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