Atomic structures - ii Flashcards
The energy of electron moving with velocity v is
En = m(rest) / sq root [1- (v/c)]
The mass of an electron whose velocity is equal to the speed of light is
infinite
mass of electron =
1/ 1837 th times the mass of hydrogen
if in a discharge tube H2 is used, the positive ray is known as
proton/canal ray
if in a discharge tube, other elements are used, the ray is known as:
positive ray
The magnetic quantum number depends on:
Zeeman effect
does the value of e/m depend on the nature of the gas used in the discharge tube?
no
Positron was discovered by
Anderson
it combines with electron producing gamma rays
Pi-meson and mu-meson were discovered by
Yukawa
it lies between proton and neutron
Neutrinos and antineutrinos were discovered by:
Femi
It has mass and charge nearly equal to zero
isosteres?
molecules having the same at. no and electrons
rutherford discovered?
nucleus of an atom
the rutherford scattering experiment uses:
helium nucleus and not helium atoms
alpha particles are
helium neucleus
calculation of the highest energy is carried out by:
(n + l) n = principle quantum number and l = azimuth quantum number
Quantum theory explains that radiant energy is absorbed
not continuously but discontinuously
what is a photon?
a quanta of light ray is called a photon
it has NO MASS
relationship between rydberg’s constant and electron is:
R is directly proportional to the mass of electron
the angular momentum of the spin of all electrons is:
h/2pi sq root s(s+1) or
(sq root 3)*h /4
a node is calculated by:
n-l-1
the rays of electrons are known as :
beta rays
which isotope of hydrogen is radioactive?
tritium
the value of kinetic energy is equal to :
in terms of charge and acceleration
Relative charge× accelerating potential
what does Millikan’s oil drop method experiment on?
to prove the charge of an electron
