radiation and thermal energy
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/1.jpg)
Radiation and Thermal Energy
Our Model of the Atom Evolves
![Page 2: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/2.jpg)
• In a chemical reaction, what is happening to the system when there is a change in temperature?
![Page 3: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/3.jpg)
• What changes occur in a system when radiating is the transfer mechanism?
![Page 4: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/4.jpg)
Observations?
![Page 5: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/5.jpg)
Incandescent light bulb
• Watch carefully as the power delivered to the light bulb is increased.
• Write down your observations.
![Page 6: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/6.jpg)
Incandescent light bulb
• Now view the light bulb through a spectrometer as the power delivered to the bulb is increased.
• Write down your observations
![Page 7: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/7.jpg)
![Page 8: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/8.jpg)
Compact fluorescent light bulb
• Watch carefully as the power delivered to the light bulb is increased.
• Write down your observations.
![Page 9: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/9.jpg)
Compact fluorescent light bulb
• Now view the light bulb through a spectrometer.
• Write down your observations
![Page 10: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/10.jpg)
What is the difference?
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• A hot solid gives a continuous spectrum while a heated gas gives only a piece of the spectrum.
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• An input of energy is required to make the atoms of an atomic gas emit radiation.
• The radiation emitted by each element is unique.
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• A change in temperature results in a change in structure.
• A change in structure results in the emission of light.
![Page 14: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/14.jpg)
• In a compound a change in structure can be explained by a rearrangement of the atoms.
• How about in atomic gases?
![Page 15: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/15.jpg)
• In atomic gases the change in structure has to be at the atomic level.
![Page 16: Radiation and Thermal Energy](https://reader030.vdocuments.us/reader030/viewer/2022033018/56816027550346895dcf2c42/html5/thumbnails/16.jpg)
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.