Estimation quiz!

[johanw]

(08-01-2020 05:24 PM)ijabbott Wrote:  A useful approximation for electronics: speed of light ≈ 1 foot per nanosecond.

Are all these ancient units still used in papers? I still remember the scolding I got when I entered wavelengths in Ångström (1Å = \(10^{-10}\)m) in my masters thesis. I had to change it to nm before I could get a passsing grade, the faculty had a strict SI-only policy.