Pressure in gas discharge tube was kept________________?
(A) 10 torr
(B) 1 torr
(C) 0.1 torr
(D) 0.01 torr
Which one of the following explain the shape of orbitals _________________?
(A) Principal of quantum number
(B) Azimuthal quantum number
(C) Magnetic quantum number
(D) Spin quantum number
Splitting of spectral lines when atom is subjected to magnetic field is called _______________?
(A) Zeemans effect
(B) Starks effect
(C) Photo electric effect
(D) Compton effect
Rutherfords planet like structure was defective and unsatisfactory because_________________?
(A) Moving e- accelerate towards the nucleus
(B) Continuous spectrum
(C) behavior of electron remain unexplained
(D) all
Which one is not true about cathode rays ?
(A) 9.11×10-31 Kg
(B) Cast shadow
(C) Heat up the platinum foil
(D) Cannot ionize
When an atom absorbs energy the lines in the spectrum will appear which are_________________?
(A) Brighter
(B) Darker
(C) Colourless
(D) Hard to locate
The maximum number of electron in a sub shell with ? = 3fs______________?
(A) 6
(B) 10
(C) 14
(D) 18
The magnetic quantum number (QN) has its values determined directly by the value of_______________?
(A) Principal (QN)
(B) Azimuthal (QN)
(C) Spin (QN)
(D) Both A & B