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
Physics MCQs with Answers
Radiation produced from TV picture tube is_____________?
A. B-rays B. X-rays C. Far infrared D. Infrared
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
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 produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
A. 6.2 x 10-10m B. 9.1 x 10-18m C. 3.11 x 10-10m D. 4 x 10-10m
Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?
A. Number of incident electron i.e. filament current B. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated C. The soft target which can easily emit electrons D. All of above are correct
X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
A. The ions in a crystal are well arranged B. The lines in a diffraction grating cannot reflect X-rays. C. The 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
UV radiation can be produced by______________?
A. Heating the filament B. Electron excitation in the gas C. Ionization of atoms D. All the above
Wave-like characteristic of electron is demonstrated by______________?
A. Line spectrum of atoms B. Production of x-rays. C. Diffraction by crystalline solids D. Photoelectric effect
Electron cannot exist in the nucleus it is confirmed by observing that______________?
A. It does emit radiation B. Its size as compare to proton and neutron is very small C. No antiparticle of electron is present D. The velocity of electron must be very high according to uncertainty principle