Questions and Answers
Which of the following will not generate electromagnetic waves or pulses?
An electromagnetic wave is traveling along the +z axis of a right-handed coordinate system. At a certain moment, the magnetic field is in the +x direction. What direction is the electric field pointing?
The various colors of visible light differ in:
A ray of light is reflected from two mirrored surfaces. Which entry in the table below is correct?
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An observer O, facing a mirror, observes a light source S. Where does O perceive the mirror image of S to be located?
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An object is placed 30 cm from a concave spherical mirror with a radius of curvature of 40 cm. Which best describes the image?
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An object is placed 30 cm from a convex spherical mirror with a radius of curvature of 40 cm. Which best describes the image?
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A beam of light passes from air into water. Which is necessarily true? (nwater=1.33)
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The figure below shows the behavior of a ray of light at the boundary between air and water. The index of refraction of water for light of this wavelength is 1.33. What is true?
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A fish swims below the surface of the water at P. An observer at O sees the fish at:
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Study Notes
Electromagnetic Waves
- A steady direct current does not produce electromagnetic waves or pulses.
- An accelerated electron, a vibrating bar magnet, and charged particles in circular motion do generate electromagnetic waves.
Electric and Magnetic Fields
- In a right-handed coordinate system, if an electromagnetic wave travels along the +z axis with the magnetic field in the +x direction, the electric field points in the -y direction.
Visible Light Spectrum
- The colors of visible light differ in both frequency and wavelength.
Reflection of Light
- When a ray of light reflects off two mirrored surfaces, the angles of incidence and reflection lead to specific angles that follow the law of reflection.
Image Perception in Mirrors
- An observer perceives the mirror image of a light source located directly behind the mirror at the same distance as the source, creating a virtual image.
Concave Mirror Image Formation
- An object placed 30 cm from a concave mirror with a radius of curvature of 40 cm produces a real image located 60 cm from the mirror.
Convex Mirror Image Formation
- An object placed 30 cm from a convex mirror forms a virtual image located 12 cm from the mirror.
Refraction of Light
- When light passes from air to water, the frequency remains unchanged while the wavelength decreases due to the refractive index of water being 1.33.
Index of Refraction
- The index of refraction is a measure of how much light bends when entering a new medium; values vary depending on the material.
Apparent Depth in Water
- A fish observed from above the water surface appears to be at a smaller depth than it actually is due to the refraction of light at the air-water interface.
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Description
Test your understanding of electromagnetic waves with these interactive flashcards. This quiz covers the conditions under which electromagnetic waves are generated and specific scenarios involving charged particles. Perfect for students looking to reinforce their knowledge of physics concepts.
