Atomic and Nuclear Physics Answers

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?

14. . Living matter has an activity of 260 Bq/kg due to carbon – 14. If a sample of wood from a
burial site has an activity of 155 Bq/kg, estimate the age of the site. (Assume the half – life
of carbon – 14 is 5730 years).



20. 20. 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)
21. Calculate the radius of the 3rd orbit of an atom with 1 proton and 2 neutrons. (2 marks)
22. 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.
(2 marks)
23. 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? (2 marks)
24. 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.

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.

the electric field near the origin is given by E=(3xi+5j)v/m. imagine a gaussian surface shaped like a cube with one corner at the origin and another at (-2,2,2) meters, with all faces parallel to x-y,x-z, or y-z planes. what is the net flux through gaussan cube?

Living matter has an activity of 260 Bq/kg due to carbon – 14. If a sample of wood from a
burial site has an activity of 155 Bq/kg, estimate the age of the site. (Assume the half – life
of carbon – 14 is 5730 years).

Answer this assignment by Mark wise
1. (a) What is the main difference between unit cell and primitive cell? For Marks 1
(b) Write down the importance of single crystal in electronics. For 3 marks
(c) How can Miller indices help to analyze the crystal structures? Give at least one example. For 4 marks
2. (a) What are the reasons for having defects in crystal? And what are ways of
reducing defects in crystal? For 4 marks
(b) Explain the mechanism of having free electronics in metals. 2
(c) Is bonding energy positive or negative? Explain your logic. 2