Radiation and thermal energy
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Radiation and Thermal Energy. Our Model of the Atom Evolves. In a chemical reaction, what is happening to the system when there is a change in temperature?. What changes occur in a system when radiating is the transfer mechanism?. Observations?. Incandescent light bulb.

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Radiation and Thermal Energy

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Radiation and thermal energy

Radiation and Thermal Energy

Our Model of the Atom Evolves


Radiation and thermal energy

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


Radiation and thermal energy

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


Observations

Observations?


Incandescent light bulb

Incandescent light bulb

  • Watch carefully as the power delivered to the light bulb is increased.

  • Write down your observations.


Incandescent light bulb1

Incandescent light bulb

  • Now view the light bulb through a spectrometer as the power delivered to the bulb is increased.

  • Write down your observations


Compact fluorescent light bulb

Compact fluorescent light bulb

  • Watch carefully as the power delivered to the light bulb is increased.

  • Write down your observations.


Compact fluorescent light bulb1

Compact fluorescent light bulb

  • Now view the light bulb through a spectrometer.

  • Write down your observations


What is the difference

What is the difference?


Radiation and thermal energy

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


Radiation and thermal energy

  • An input of energy is required to make the atoms of an atomic gas emit radiation.

  • The radiation emitted by each element is unique.


Radiation and thermal energy

  • A change in temperature results in a change in structure.

  • A change in structure results in the emission of light.


Radiation and thermal energy

  • In a compound a change in structure can be explained by a rearrangement of the atoms.

  • How about in atomic gases?


Radiation and thermal energy

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


Our current model of the atom

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.


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