Radiation

Use a powerful flashlight to pop a kernel of popcorn. A lens focuses light on the kernel. The temperature of the filament and the distance between the flashlight and lens can be changed. Several obstacles can be placed between the flashlight and the popcorn.

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LEARNING OBJECTIVES:

  • Learn that hot objects naturally transfer heat to their environment via radiation (light).
  • Observe that the color we see radiated by a hot object is determined by its temperature.
  • Determine that objects emitting visible light also emit invisible infrared light.
  • Observe that both visible and invisible light can heat objects.
  • See that radiation given off by a hot object is usually a blend of several colors of light.
VOCABULARY:
  • filament, infrared, Kelvin scale, radiation

LESSON MATERIALS:

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