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. (D)</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. (A)</p> Signup and view all the answers

What is the purpose of a sundial?

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

What is an example of an opaque substance?

<p>Wood (C)</p> Signup and view all the answers

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

<p>Transmission (A)</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. (D)</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. (A)</p> Signup and view all the answers

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

<p>Some plastics (D)</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. (A)</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. (A)</p> Signup and view all the answers

What is the purpose of using shadows in a sundial?

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

What is the main characteristic of opaque substances?

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

What is the primary difference between transparent and opaque substances?

<p>Their ability to transmit light (D)</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 (A)</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 (D)</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 (C)</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 (D)</p> Signup and view all the answers

What is the primary characteristic of opaque substances?

<p>They absorb or reflect all the light. (C)</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. (C)</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. (C)</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. (C)</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. (D)</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. (D)</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. (D)</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. (C)</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. (C)</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. (C)</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. (A)</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. (C)</p> Signup and view all the answers

What is the primary function of a sundial?

<p>To tell time using shadows. (A)</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. (A)</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. (B)</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. (A)</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. (C)</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. (A)</p> Signup and view all the answers

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