Light Waves and Electromagnetic Theory Quiz

What did James Maxwell show about light waves in 1869?

• Light waves are a type of sound wave.

• Light waves are electromagnetic waves composed of electric and magnetic fields.

• Light waves need a medium to travel through.

• Light waves travel faster than sound waves.

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What is the speed of light in meters per second?

• 300,000 km/s

• 3 x 10^8 m/s

• 186,000 miles per second

• 300,000 miles per second

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Which of the following is NOT a characteristic of light waves?

• They have wavelengths and frequencies.

• They require a medium to travel through.

• They travel at the speed of light in a vacuum.

• They can be reflected and refracted.

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In reflection, what is true about the angle of incidence and the angle of reflection?

• The angle of incidence is always greater than the angle of reflection.

• The angle of incidence equals the angle of reflection.

• The angle of incidence is always less than the angle of reflection.

• There is no relationship between the angles of incidence and reflection.

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What causes the scattering of light on a rough surface?

• The light is absorbed by the surface.

• The surface is uneven, causing the light to reflect in many directions.

• The light changes speed as it enters the rough surface.

• The light is refracted at the same angle.

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What happens to light when it passes from air into water?

• The light speeds up and bends away from the normal.

• The light slows down and bends toward the normal.

• The light speeds up and bends toward the normal.

• The light doesn’t change direction or speed.

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What is the refractive index of a material?

• The speed at which light travels through the material.

• The amount of bending a light ray experiences when entering the material.

• The color of light absorbed by the material.

• The frequency of light passing through the material.

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How does a lens use refraction to affect light?

• It focuses light rays in one direction or disperses them.

• It absorbs light waves.

• It causes light to reflect in multiple directions.

• It changes the frequency of the light.

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What does the color of an object depend on?

• The wavelength of light that is absorbed.

• The wavelength of light that is reflected.

• The angle at which light strikes the object.

• The amount of light absorbed and reflected.

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Which of the following electromagnetic waves has the highest frequency?

• Radio waves

• Visible light

• Gamma rays

• X-rays

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