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
Physics MCQs with Answers
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
Bracket series is obtained when all transition of electron terminate on_______________?
A. 4th orbit B. 5th orbit C. 3rd orbit D. 2nd orbit
The penetrating power of X-rays depends on their______________?
A. applied voltage B. frequency C. source D. all of the above
Reverse process of photoelectric effect is_______________?
A. pair production B. Compton effect C. annihilation of matter D. X-rays production
Radiation with wavelength longer than red lights______________?
A. ultraviolet rays B. X-rays C. infra red radiation D. visible radiation
In an electronic transition atom cannot emit______________?
A. γ-rays B. Infra red radiation C. Visible light D. Ultraviolet rays
X-rays are similar in nature to_______________?
A. Cathode rays B. Positive rays C. γ-rays D. Beta rays
When X-rays are passed through successive aluminum sheets what happens to their thickness ?
A. increases B. it decreases C. it remains same D. sometimes increases and sometimes decreases
Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
A. A & B B. B & C C. A & C D. A B & C