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

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. A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?

   A. independent mass m
   B. directly proportional to m
   C. directly proportional to q
   D. directly proportional to B

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. If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?

   A. 4 rad. S-1
   B. 5 rad. S-1
   C. 1.6 rad. S-1
   D. 2.8 ms-1

5. A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be_____________?

   A. πR
   B. 2π R
   C. 0
   D. 4πR

6. When a body moves in a circle of radius r with linear speed V its centripetal force is_______________?

   A. mV/r2
   B. mV/r
   C. mV2/r
   D. mV2/r2

7. An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?

   A. 0
   B. π²
   C. 2 π²
   D. 4 π²

   Submitted by: Tauseef Ali

8. A train is moving with a speed of 100mph. What will be its speed in m/s.?

   A. 45 m/s
   B. 90 m/s
   C. 100 m/s
   D. 120 m/s

   Submitted by: Zahid Jagirani

9. 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

10. 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