461. Spectrum is produced due to________________?
A. Different wavelength
B. Different colours
C. Different intensities
D. all have little contribution

462. When electron jump into orbit 1 then series obtained is___________________?
A. Lyman
B. Paschen
C. Pfund
D. Brackett

463. 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

464. Three quantum number have been derived from equation of____________________?
A. de-Broglie
B. Plancks
C. Schrodinger
D. Heisenberg

465. The letters s p d and f are used to represent which quantum numbers________________?
A. Principal
B. Azimuthal
C. Magnetic
D. Spin

466. The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
A. 7
B. 10
C. 12
D. 16

467. Colour of fluorescene produced by cathode rays depends upon________________?
A. Temperature
B. Pressure
C. Volume
D. Composition of glass

468. 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

469. The relationship between energy of a photon of light and its frequency is given by________________?
A. de-Broglie duel nature of matter
B. Bohrs model
C. Plancks Quantum theory
D. Rutherfords atomic model

470. The velocity of the photon____________________?
A. Is independent of wave length
B. Depends upon source
C. Depends upon its frequency
D. Equals to the square of amplitude