Positive rays are produced__________________?
(A) By burning of gas
(B) By cooling of the gas
(C) By the bombardment of cathode rays on gas molecules
(D) From anode like cathode rays produced from cathode
Colour of fluorescene produced by cathode rays depends upon________________?
(A) Temperature
(B) Pressure
(C) Volume
(D) Composition of glass
The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
(A) 7
(B) 10
(C) 12
(D) 16
The letters s p d and f are used to represent which quantum numbers________________?
(A) Principal
(B) Azimuthal
(C) Magnetic
(D) Spin
Three quantum number have been derived from equation of____________________?
(A) de-Broglie
(B) Plancks
(C) Schrodinger
(D) Heisenberg
Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________?
(A) Zeeman effect
(B) Stark effect
(C) Photoelectric effect
(D) Compton effect
When electron jump into orbit 1 then series obtained is___________________?
(A) Lyman
(B) Paschen
(C) Pfund
(D) Brackett
Spectrum is produced due to________________?
(A) Different wavelength
(B) Different colours
(C) Different intensities
(D) all have little contribution
Wavelength of electron was verified by_________________?
(A) Moseley
(B) Davisson and Germer
(C) Einstein
(D) Roentgen
Sommerfelds modification in Bohrs model is_______________?
(A) Orbit is cylindrical
(B) Orbit is elliptical
(C) Orbit is longitudinal
(D) Orbit is asymmetrical