What happens when molecules interact with radiation?
Begin by opening the Molecular Interactions with Electromagnetic Radiation learning tool. There is an interactive electromagnetic spectrum at the top; by moving the bar on the spectrum, you can see how wavelengths and frequencies vary for different types of radiation.
Worked Example
Question: How is an atmospheric CFC molecule affected by (a) UV radiation and (b) IR radiation?
- Drag the electromagnetic spectrum bar to the 'Ultraviolet' region. Notice that UV radiation causes a bond in the CFC molecule to break apart.
- Drag the bar to the 'Infrared' region. Notice that infrared radiation causes stretching and bending of the bonds in the CFC.
Your Turn
Challenge: Use the Molecular Interactions with Electromagnetic Radiation learning tool to determine how molecules in food are affected by microwaves. Does this explain why microwaves heat our food so effectively?