Einstein_blackboard.jpg
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Summary
Description Einstein blackboard.jpg |
English:
A blackboard used by
Albert Einstein
in a 1931 lecture in
Oxford
. The last three lines give numerical values for the density (ρ), radius (P), and age of the universe. The
blackboard
is on permanent display in the
Museum of the History of Science
,
Oxford
The formulae are: D = 1/c 1/l dl/dt = 1/c 1/P dP/dt D^2 = 1/P^2 (P0-P)/P ~ 1/P^2 (1a) D^2 = k rho/3 (P0-P)/P ~ k rho (2) D^2 ~ 10^-53 rho ~ 10^-26 P ~ 10^8 L.I. [or y.? then L.y. = light-year.] A ~ 10^10 (10^11) I [or y.? = year => an estimate for the age of the universe.] |
Date | |
Source | Own work |
Author |
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