Bracket series is obtained when all transition of electron terminate on_______________?

Related Mcqs:

1. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

   A. a straight line parallel to the field
   B. a parabola in a plane perpendicular to the field
   C. a circle in a plane perpendicular to the field
   D. a straight line along its initial direction

2. For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?

   A. 107m/sec
   B. Should be greater than the speed of light.
   C. Be zero
   D. Not be wave-like

3. In bringing an electron towards the second electron, the electrostatic potential energy of the system

   A. Decreases
   B. increases
   C. remains the same
   D. becomes zero

   Submitted by: Tauseef Ali

4. Ratio of the weight of H-atom to that of an electron is approximately______________?

   A. 18.336
   B. 1836
   C. 18360
   D. 183.6

5. 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

6. 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

7. 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

8. 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

9. In an electronic transition atom cannot emit______________?

   A. γ-rays
   B. Infra red radiation
   C. Visible light
   D. Ultraviolet rays

10. In addition to the daughter nucleus and an electron or positron, the products of a beta decay

    A. Neutrons
    B. Neutrino
    C. Alpha particle
    D. Proton

    Submitted by: Alina Malik