One quantum transition makes light at 21 cm

Post by [deleted] » Thu, Apr 24, 2025, 5:17 PM UTC

schrectacular wrote: post #24

mystifyingpoi wrote: post #16

Earlier quoted context omitted.

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Post by [deleted] » Thu, Apr 24, 2025, 5:23 PM UTC

mightysashiman wrote: post #20

dang wrote: post #60

[stub for offtopicness] [come on you guys]

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Post by dleeftink » Thu, Apr 24, 2025, 5:25 PM UTC

ivape wrote: post #27

jpollock wrote: post #8

Earlier quoted context omitted.

Admiral Hopper[1] used to use string to demonstrate how long pieces of time are: https://www.youtube.com/watch?v=9eyFDBPk4Yw [1] https://en.wikipedia.org/wiki/Grace_Hopper

Woah. Imagine extrapolating that for life. What does it mean to throw away a day?

Post by raldi » Thu, Apr 24, 2025, 5:29 PM UTC

amiga386 wrote: post #18

> precisely 21 cm Imprecise use of "precise" in the strapline. According to https://en.wikipedia.org/wiki/Hydrogen_line the best measurement of it so far is 21.106114054160 +/- 0.000000000030 cm

Post by MomsAVoxell » Thu, Apr 24, 2025, 5:32 PM UTC

cogman10 wrote: post #3

Suppafly wrote: post #2

I had a CS professor that used to hold up a length of string roughly that length and talk about how that is how far a bit of data can travel at the speed of light during a clock cycle or something. Honestly don't remember the point he was trying to make.

Probably trying to recreate this lecture by Grace Hopper [1] [1] https://www.youtube.com/watch?v=9eyFDBPk4Yw