Ground state energy of the 4th orbit in a H-atom is_____________?

Related Mcqs:

1. The metastable state for an atom in laser light is_____________?

   A. 10-4 sec
   B. 10-5 sec
   C. 10-3 sec
   D. 10-8 sec

2. The energy liberated when one atom of U-235 undergoes fission reaction is________________?

   A. 200MeV
   B. 40MeV
   C. 30MeV
   D. 20MeV

3. In normal state of energy the incident high energy photons will be______________?

   A. Stimulated
   B. Absorbed
   C. Cause X-ray emission
   D. Cause laser production

4. 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

5. Excited atoms return to their ground state in_______________?

   A. 10-10s
   B. 10-8s
   C. 10-6s
   D. 10-9s

6. 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

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

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

8. 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

9. Electron moves in the orbit as________________?

   A. Simple vibratory motion
   B. Standing wave motion
   C. Vibratory motion like up and down
   D. S.H.M likes the sound

10. 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