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Radiation and Thermal Energy

Radiation and Thermal Energy

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Radiation and Thermal Energy

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  1. Radiation and Thermal Energy Our Model of the Atom Evolves

  2. In a chemical reaction, what is happening to the system when there is a change in temperature?

  3. What changes occur in a system when radiating is the transfer mechanism?

  4. Observations?

  5. Incandescent light bulb • Watch carefully as the power delivered to the light bulb is increased. • Write down your observations.

  6. Incandescent light bulb • Now view the light bulb through a spectrometer as the power delivered to the bulb is increased. • Write down your observations

  7. Compact fluorescent light bulb • Watch carefully as the power delivered to the light bulb is increased. • Write down your observations.

  8. Compact fluorescent light bulb • Now view the light bulb through a spectrometer. • Write down your observations

  9. What is the difference?

  10. A hot solid gives a continuous spectrum while a heated gas gives only a piece of the spectrum.

  11. An input of energy is required to make the atoms of an atomic gas emit radiation. • The radiation emitted by each element is unique.

  12. A change in temperature results in a change in structure. • A change in structure results in the emission of light.

  13. In a compound a change in structure can be explained by a rearrangement of the atoms. • How about in atomic gases?

  14. In atomic gases the change in structure has to be at the atomic level.

  15. Our current model of the atom…. • Does not account for these differences in structure, therefore we need a model of the atom with some more internal structure that can account for the radiation emitted by atoms.