20: atomic spectra Flashcards
Name the types of emission spectra?
1:continuous spectrum
2:band spectrum
3:line or discrete spectrum
example of each type of spectrum?
1: black body radiation
2: molecular spectrum
3:atomic spectra
define atomic spectrum?
is define as
‘‘A spectrum of radiation due to transitions between energy levels in an atom or due to absorption or emission.’’
what is RH and its value?
RH is known as Rydberg’s constant.
it’s value is 1.0974 x 10^7/m.
where do Lyman series lies in region?
Lyman series lie in ultraviolet region.
In which year Bohr introduced his atomic model of hydrogen?
In year 1913.
Explain the second postulate of Bohr’s atomic model with equation?
mvr= nh/2pie.
n is principle quantum number.
Symbol of Planck’s constant and it’s value?
symbol of Planck’s constant is h.
it’s value is 6.625×10−34 joule-hertz−1 (or joule-seconds).
K is known as coulombs constant
write it’s value?
9x10^9 N⋅m 2 /C 2.
what does nth excited state means?
nth state means (n+1)th orbit.
Define ground and excited state in one line?
G.S= when electrons is in its lowest energy state.
E.S=when the electrons are in its higher orbit.
when the electrons are isolated from its atom then the atom is said to be?
then the atom is said to be ionized.
who discovered X-rays?
X-rays were discovered by garmen physicist Dr. Rontgen in year 1895.
Define x-rays?
When fast moving electrons strike on a metal surface, photon of very high energy are emitted known as x-rays.
define laser?
Laser is an acronym for light amplification by stimulated emission of radiation.
