Which one of following postulate is in accordance with the Rutherfords model ?
(A) continuous spectra for atoms
(B) discrete spectra for atoms
(C) either continuous nor discrete
(D) no spectrum
When we excite some atoms by heat collision or electrical discharge they will________________?
(A) radiate electromagnetic energy with a continuous distribution of wavelength
(B) absorb particular wavelengths when white light is incident on them
(C) radiate electromagnetic energy of discrete characteristic wavelength
(D) emit either invisible or visible light
In obtaining an X-ray photograph of our hand we use the principle of______________?
(A) photo electric effect
(B) ionization
(C) shadow photograph
(D) any of above
Photon of highest frequency will be absorbed when transition takes place from_____________?
(A) 1st to 5th orbit
(B) 2nd to 5th orbit
(C) 3rd to 5th orbit
(D) 4th to 5th orbit
The radiations emitted form hydrogen filled discharge tube show____________?
(A) band spectrum
(B) line spectrum
(C) continuous spectrum
(D) absorption spectrum
The characteristic X-rays spectrum is due to_____________?
(A) The illumination of the target metal by ultra-violet radiation
(B) The bombardment of the target by protons
(C) The bombardment of target by electrons
(D) The absorption of radiation by the target metal
The minimum wavelength of X-rays can further be reduced by _______________?
(A) Reducing the pressure or cooling the target
(B) Increasing the temperature of the filament.
(C) Using a target element of higher atomic number
(D) Increasing the potential difference between the cathode and the target
Radiation produced from TV picture tube is_____________?
(A) B-rays
(B) X-rays
(C) Far infrared
(D) Infrared
In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?
(A) he/ev
(B) he/Vc
(C) eV/h
(D) impossible to predict