Radiation with wavelength longer than red lights:
A. ultraviolet rays
B. X-rays
C. infra red radiation
D. visible radiation
Reverse process of photoelectric effect is:
A. pair production
B. Compton effect
C. annihilation of matter
D. X-rays production
The penetrating power of X-rays depends on their:
A. applied voltage
B. frequency
C. source
D. all of the above
Bracket series is obtained when all transition of electron terminate on:
A. 4th orbit
B. 5th orbit
C. 3rd orbit
D. 2nd orbit
The electric P.E of an electron in an orbit at a distance rn from the positive charge:
A. Ke2/rn
B. Ke2/rn2
C. ÀKe2/rn
D. ÀKe2/rn2
Ground state energy of the 4th orbit in a H-atom is:
A. 13.60 eV
B. 3.40 eV
C. 0.85 eV
D. 1.51 eV
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
Total number of series in hydrogen spectrum is:
A. three
B. four
C. five
D. six
