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 […]
In the modern periodic table, 118 known elements got the place out of which 94 were found naturally on earth and 24 were 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 […]
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 galaxy […]
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 […]
