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

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

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

What is the path that light travels through space?

<p>Straight (B)</p> Signup and view all the answers

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

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

What is a common characteristic of luminous objects?

<p>They emit light (A)</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 (A)</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 (C)</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 (C)</p> Signup and view all the answers

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

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

What does the image from NASA show?

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

Why is the Moon not considered a luminous object?

<p>It does not emit its own light (D)</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 (A)</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 (B)</p> Signup and view all the answers

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

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

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

<p>Radiation (D)</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 (D)</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 (C)</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 (B)</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 (D)</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 (B)</p> Signup and view all the answers

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

<p>Its speed (B)</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 (C)</p> Signup and view all the answers

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

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

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