Electron moves in the orbit as________________?

Related Mcqs:

1. 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

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. 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

4. 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

5. The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?

   A. a circle
   B. a spiral
   C. an ellipse
   D. helix

6. The radius of geostationary orbit from the centre of the earth is nearly______________?

   A. 42000km
   B. 36000km
   C. 24000 km
   D. 18000 km

7. How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?

   A. 365 days
   B. 730 days
   C. 329 days
   D. 129 days

8. 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

9. An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?

   A. Angular Momentum
   B. Angular Displacement
   C. Linear Velocity
   D. None of the above

   Submitted by: Naveed Tahir

10. In an electron microscope, we use energetic particles because of______________?

    A. Penetrating power is high
    B. Kinetic energy is large
    C. Wavelength is very short
    D. All the above reasons