A photon of sunburn light has a wavelength of 300 nm…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A photon of sunburn light has a wavelength of nm. The C-C bond in a molecule needs eV to break. Use eV nm. Find the energy of the photon, the energy that it has beyond the bond energy, and the longest wavelength of light that could break the bond.
Need a reminder? The key ideaShow
Ultraviolet photons can break chemical bonds of a few eV. The Earth's temperature without a greenhouse effect follows from . The ionosphere returns a vertical wave below , and an oblique wave below . A tower of height sees to the horizon at .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The photon energy. .
Step 2. Beyond the bond energy. . The photon can break the bond.
Step 3. The longest wavelength. . Light of a longer wavelength has less energy than the bond. It cannot break it, however bright it is.
Answer: eV; eV; nm.
Check. The wavelength nm is in the ultraviolet, just below the visible band. Visible light cannot break this bond.
Discussion (0)
Log in to join the discussion.
Loading…