Speed of light =299792458m/s 0r approx 300000km/sec Second= 9192631770 cycles of the standard caesium 133 atom(55) transition (electron vibration pulse)- in future optical clocks because of less uncertainty Metre= the length of the path travelled by light in a vacuum during a time interval of 1/299792458 of a second Pm=Picometer unit of length equivalent to… Continue reading I learned it today – understanding length in metres
Month: January 2021
I learned it today- periodic table, elements and related timeline
In the modern periodic table 118 known elements got the place out of which 94 were found naturally on earth and 24 to be created in a lab. The international union of pure and applied chemistry (IUPAC) has an inter divisional committee on Nomenclature and Symbols. This committee is recognized as world authority in developing… Continue reading I learned it today- periodic table, elements and related timeline
I learned it today – earth’s geological timeline
13.8 Billion years ago – Big Bang space and time becoming different dimensions, 13.76 Billion years ago- Cosmic dark age 13.4 Billion years as go – first stars 13.2 Billion years ago- oldest known galaxy GN-z11 13.1 Billion years ago – oldest gamma ray burst GRB 090423 13.5 -12.9 Billion years ago – Milky way… Continue reading I learned it today – earth’s geological timeline
I learned it today – Human evolution timeline
Bc-before christdom Bce- before Christian era(same as bc) Ad- Anno domini( after death) Ce- Christian era(same as Ad) Mya-million years ago Bya – Billion years ago Bp- before present (same as years ago) C. = circa (approximately) Million years of Human evolution tree c. 46 Mya- separate evolution line from Lemurs, Lorises and Galagos 37… Continue reading I learned it today – Human evolution timeline
