27.4 Transparent vs Opaque

What kind of energy is light?

• Mechanical

• Electrical

• Electromagnetic

• Sound

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What happens when light strikes matter?

• Electrons in the matter stop vibrating.

• Electrons in the matter are forced into vibration.

• The matter becomes colder.

• The light is destroyed.

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What determines how a material responds to light?

• The color of the material

• The temperature of the material

• The frequency of the light and the natural frequency of electrons in the material

• The size of the material

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At what rate does visible light vibrate?

• 100 thousand times per second

• 100 million times per second

• 100 billion times per second

• More than 100 trillion times per second

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What kind of materials transmit light?

• Opaque

• Transparent

• Reflective

• Absorbent

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What are examples of transparent materials?

• Wood and stone

• Metal and glass

• Glass and water

• Paper and cloth

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What is the natural vibration frequency of electrons in glass?

• Infrared range

• Visible light range

• Ultraviolet range

• X-ray range

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What happens when ultraviolet light shines on glass?

• Reflection occurs.

• Refraction occurs.

• Resonance occurs.

• Absorption occurs.

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Why is glass not transparent to ultraviolet light?

• It reflects ultraviolet light.

• It absorbs ultraviolet light and converts it to heat.

• It transmits ultraviolet light.

• It bends ultraviolet light.

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What is the term for when light strikes a material and rebounds?

• Transmission

• Absorption

• Reflection

• Refraction

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