The Physics Teacher
© 2022 Authors.
Included after a 12 month embargo in accordance with publisher policy.
Original Publication Citation
Adam, J. (2022). Solutions for Fermi questions, October 2022 cloud ripple pattern. The Physics Teacher, 60(7), A611. https://doi.org/10.1119/10.0014319
Adam, John, "Solutions for Fermi Questions, October 2022 Cloud Ripple Pattern" (2022). Mathematics & Statistics Faculty Publications. 220.
Available for download on Friday, September 22, 2023
Answers to the questions: Last summer, as I was walking across campus I noticed the above clouds with a wave-like structure. This cloud is most likely an isolated example of altocummulus undulatus, which most commonly occurs in the altitude range of 2.5 - 6 km. This cloud was at approximately a 45-degree elevation, and the wavelength (or crest-to-crest distance) was about the width of my index finger held at arm's length. Estimate this wavelength.
Estimate the area of the shadow cast on the ground by the cloud.