Physics MCQs

852 MCQs  (Page 12 of 86)

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
X-ray are________________?
A. Of unknown nature
B. High energy electrons
C. High energy photons
D. Radio isotopes
The radiations emitted form hydrogen filled discharge tube show____________?
A. Band spectrum
B. Line spectrum
C. Continuous spectrum
D. Absorption spectrum
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