Gr 8 Natural Sciences Ch 3.4: Opaque and transparent substances
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Questions and Answers

What happens to light when it hits an opaque surface?

  • It passes through the material with little absorption or reflection.
  • It is absorbed by the material and converted into other forms of energy. (correct)
  • It bounces off in all directions.
  • It is transmitted through the surface.

    • What is an example of a translucent substance?

  • Metal
  • Clear glass
  • Frosted glass (correct)
  • Wood

    • What is the term for substances that transmit most of the light?

  • Translucent
  • Opaque
  • Transparent (correct)
  • Reflective

    • What is the main reason why shadows are created?

    <p>Because light travels in straight lines and cannot pass through opaque objects.</p> Signup and view all the answers

    What happens to light when it hits a transparent surface?

    <p>It passes through the material with little absorption or reflection.</p> Signup and view all the answers

    What is the purpose of a sundial?

    <p>To tell time.</p> Signup and view all the answers

    What is an example of an opaque substance?

    <p>Wood</p> Signup and view all the answers

    What is the term for the process of light passing through a material?

    <p>Transmission</p> Signup and view all the answers

    What happens to light when it hits a transparent substance?

    <p>Most of it passes through with little absorption or reflection.</p> Signup and view all the answers

    What is the main difference between transparent and translucent substances?

    <p>The amount of light they allow to pass through.</p> Signup and view all the answers

    What is an example of a material that is both transparent and translucent?

    <p>Some plastics</p> Signup and view all the answers

    What happens to the light that is absorbed by an opaque substance?

    <p>It is converted into other forms of energy.</p> Signup and view all the answers

    Why can we see objects clearly through transparent materials?

    <p>Because they allow most of the light to pass through.</p> Signup and view all the answers

    What is the purpose of using shadows in a sundial?

    <p>To tell time.</p> Signup and view all the answers

    What is the main characteristic of opaque substances?

    <p>They do not allow light to pass through.</p> Signup and view all the answers

    What happens to the light that is scattered by a translucent substance?

    <p>It is scattered in different directions.</p> Signup and view all the answers

    What is the primary reason why we can see objects clearly through transparent materials?

    <p>Because they transmit most of the light that hits them</p> Signup and view all the answers

    What is the characteristic of translucent substances that allows them to scatter light?

    <p>They allow some light to pass through, but not enough to see objects clearly</p> Signup and view all the answers

    What is the primary function of a sundial in terms of light and shadows?

    <p>To use shadows to indicate time</p> Signup and view all the answers

    What is the primary difference between transparent and opaque substances?

    <p>Their ability to transmit light</p> Signup and view all the answers

    What happens to the light that is not transmitted through a translucent substance?

    <p>It is scattered in different directions</p> Signup and view all the answers

    What is the primary reason why opaque substances do not allow light to pass through?

    <p>Because they absorb most of the light that hits them</p> Signup and view all the answers

    What is the primary characteristic of transparent substances that allows them to be used for observing objects?

    <p>They allow most of the light to pass through with little absorption or reflection</p> Signup and view all the answers

    What is the primary way that light travels in relation to opaque objects and shadows?

    <p>In straight lines around the object</p> Signup and view all the answers

    What is the primary characteristic of opaque substances?

    <p>They absorb or reflect all the light.</p> Signup and view all the answers

    What happens to the light that is not transmitted through a translucent substance?

    <p>It is scattered in different directions.</p> Signup and view all the answers

    What is the primary way that shadows are used in a sundial?

    <p>To indicate the time of day.</p> Signup and view all the answers

    What is the main difference between reflection and absorption of light?

    <p>Reflection involves no heat conversion, while absorption involves heat conversion.</p> Signup and view all the answers

    What can be said about the light that is transmitted through a transparent substance?

    <p>It passes through the material with little absorption or reflection.</p> Signup and view all the answers

    What is the result of light traveling in straight lines and hitting an opaque object?

    <p>The object casts a shadow on the surface behind it.</p> Signup and view all the answers

    What is a characteristic that is common to both transparent and translucent substances?

    <p>They allow some light to pass through.</p> Signup and view all the answers

    What can be said about the light that is scattered by a translucent substance?

    <p>It is scattered in different directions.</p> Signup and view all the answers

    What is the primary difference between reflection and transmission of light?

    <p>Reflection is when light bounces off a surface, while transmission is when light passes through a material.</p> Signup and view all the answers

    What happens to the light that is absorbed by an opaque substance?

    <p>It is converted into other forms of energy, usually heat.</p> Signup and view all the answers

    What is the primary reason why we can see objects clearly through transparent materials?

    <p>Because they transmit most of the light.</p> Signup and view all the answers

    What is the characteristic of translucent substances that allows them to scatter light?

    <p>They allow some light to pass through, but not enough to see objects clearly.</p> Signup and view all the answers

    What is the primary function of a sundial?

    <p>To tell time using shadows.</p> Signup and view all the answers

    What is the characteristic of opaque substances that prevents them from transmitting light?

    <p>They absorb most of the light.</p> Signup and view all the answers

    What is the primary difference between opaque and translucent substances?

    <p>Opaque substances absorb most of the light, while translucent substances transmit most of the light.</p> Signup and view all the answers

    What is the result of light traveling in straight lines and hitting an opaque object?

    <p>A shadow is created on the surface behind the object.</p> Signup and view all the answers

    What is the primary characteristic of transparent substances that allows them to be used for observing objects?

    <p>They transmit most of the light.</p> Signup and view all the answers

    What is the primary way that light travels in relation to opaque objects and shadows?

    <p>In straight lines.</p> Signup and view all the answers

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