Physics MCQs

Page No. 10

Electron cannot exist in the nucleus it is confirmed by observing that______________?


aIt does emit radiation


bIts size as compare to proton and neutron is very small


cNo antiparticle of electron is present


dThe velocity of electron must be very high according to uncertainty principle



Wave-like characteristic of electron is demonstrated by______________?


a Line spectrum of atoms


bProduction of x-rays.


cDiffraction by crystalline solids


dPhotoelectric effect



UV radiation can be produced by______________?


a Heating the filament


bElectron excitation in the gas


cIonization of atoms


dAll the above



X-rays are diffracted by a crystal but not by a diffraction grating because_____________?


aThe ions in a crystal are well arranged


bThe lines in a diffraction grating cannot reflect X-rays.


cThe penetration power of X-rays is high in a diffraction grating


dhe penetration power of X-rays is high in a diffraction grating D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal



Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?


ae______________? 0 A. Number of incident electron i.e. filament current


bThe kinetic energy of the incident electron i.e. the potential difference through which they are accelerated


cThe soft target which can easily emit electrons


dAll of above are correct



The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?


a6.2 x 10-10m


b9.1 x 10-18m


c3.11 x 10-10m


d 4 x 10-10m


View Answer 6.2 x 10-10m

The characteristic X-rays spectrum is due to_____________?


aThe illumination of the target metal by ultra-violet radiation


bThe bombardment of the target by protons


cThe bombardment of target by electrons


dThe absorption of radiation by the target metal



The minimum wavelength of X-rays can further be reduced by _______________?


aReducing the pressure or cooling the target


bIncreasing the temperature of the filament.


cUsing a target element of higher atomic number


dIncreasing the potential difference between the cathode and the target



Radiation produced from TV picture tube is_____________?


aB-rays


bX-rays


cFar infrared


dInfrared


View Answer X-rays

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_______________?


ahe/ev


bhe/Vc


ceV/h


dimpossible to predict


View Answer he/ev

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