Gr 8 Natural Sciences Ch 3.4: Radiation of light
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Questions and Answers

What is the primary source of natural light on Earth?

  • Light Bulbs
  • The Sun (correct)
  • Pinhole Cameras
  • The Moon

    • What is the definition of luminous?

  • Objects that reflect light
  • Objects that emit light (correct)
  • Objects that absorb light
  • Objects that block light

    • What is the speed of light?

  • 250,000 kilometers per second
  • 300,000 kilometers per second (correct)
  • 400,000 kilometers per second
  • 200,000 kilometers per second

    • What is the purpose of a pinhole camera?

    <p>To demonstrate how light travels</p> Signup and view all the answers

    What is the term for the transfer of energy through space as electromagnetic waves?

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

    What is the path that light travels through space?

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

    What is the term for the action of light traveling through space?

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

    What is the approximate time it takes for light to travel from the Sun to the Earth?

    <p>8 minutes</p> Signup and view all the answers

    What is a common characteristic of luminous objects?

    <p>They emit light</p> Signup and view all the answers

    What can be inferred about the Moon based on its relationship with the Sun?

    <p>It is a non-luminous object</p> Signup and view all the answers

    What is the purpose of the aluminum foil in the pinhole camera activity?

    <p>To cover the pinhole</p> Signup and view all the answers

    What is the result of using a pinhole camera?

    <p>It demonstrates how light travels in straight lines</p> Signup and view all the answers

    What is the main difference between natural and artificial light sources?

    <p>Their origin</p> Signup and view all the answers

    What is the role of the black paper in the pinhole camera activity?

    <p>To create a surface for the image</p> Signup and view all the answers

    What does the image from NASA show?

    <p>The Earth's artificial light</p> Signup and view all the answers

    What is the significance of the pinhole camera activity?

    <p>It illustrates how light travels in straight lines</p> Signup and view all the answers

    What is the primary characteristic of light that allows it to travel long distances?

    <p>Its ability to travel in straight lines</p> Signup and view all the answers

    Why is the Moon not considered a luminous object?

    <p>It does not emit its own light</p> Signup and view all the answers

    What is the main difference between the Sun and a light bulb?

    <p>The Sun is a natural source of light, while a light bulb is an artificial source</p> Signup and view all the answers

    What is the purpose of the pinhole in the pinhole camera activity?

    <p>To allow light to enter the box through a small hole</p> Signup and view all the answers

    What is the term for the movement of light through space?

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

    What is the significance of the white paper in the pinhole camera activity?

    <p>It creates an image of the outside environment</p> Signup and view all the answers

    What is a common application of artificial light sources?

    <p>Various applications such as lighting homes and streets</p> Signup and view all the answers

    What is the term for the energy transferred through space as electromagnetic waves?

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

    What is the main reason why the Moon is not considered a luminous object?

    <p>It reflects light from the Sun</p> Signup and view all the answers

    What is the purpose of using a pinhole in the pinhole camera activity?

    <p>To allow light to travel in a straight line</p> Signup and view all the answers

    What is the significance of the image from NASA showing Earth's lights at night?

    <p>It highlights humanity's reliance on artificial light sources</p> Signup and view all the answers

    What is the main difference between the way light travels from the Sun and the way light travels from a light bulb?

    <p>The distance traveled is different</p> Signup and view all the answers

    What is the role of the black paper in the pinhole camera activity?

    <p>To block out external light</p> Signup and view all the answers

    What is the primary characteristic of light that allows it to travel long distances?

    <p>Its speed</p> Signup and view all the answers

    What is the significance of the aluminum foil in the pinhole camera activity?

    <p>To create a pinhole</p> Signup and view all the answers

    What is the main difference between luminous and non-luminous objects?

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

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