Atomic and Nuclear Physics Answers

. Calculate the energy in eV of an electron in the 4th orbital of a helium atom

. If the kinetic energy of an electron in the ground state hydrogen atom is 2.2 x 10-18 J,

calculate its momentum. (2 marks)

The position of a certain electron is determined at a certain time with an uncertainty of

10-10 m. Find the uncertainty in the electron's momentum. (2 marks)

3. A piano string of length 76cm and mass per unit length of 6.91 x 10-3

kg/m is under a

tension of value 40N. What is the frequency of a note sounded by this string

Energy level diagram of "free electron" laser?

Energy level diagram of Excimer laser?

Show that the simple pendulum is a special case of compound pendulum when the moment of inertia is mLsqure when the center of mass distance of compound pendulum equal to length of simple pendulum

what is the basic principle of "free electron" laser?

what is the basic principle of Excimer laser?

An x – ray tube operates at a d.c potential difference of 40 KV. Calculate the velocity of

the incident electrons. Assume charge – mass ratio of electron,

me

e

= 1.8 x 1011 C/kg.