A physical system has dynamical variables $X,Y,Z$ represented by the $2\times2$ Pauli matrices $\sigma_x,\sigma_y,\sigma_z$.

Compute the average \(\langle f|Y|f \rangle\) and the uncertainty $\Delta Y$ for the variable $Y$ if the state is given to be $$f = \begin{pmatrix}1+3i \\3-i \end{pmatrix}$$ What does the value for $\Delta Y$ suggest? Give your remarks, if any.

# kapoor's blog

##### Sudhir Raniwala

A student asked a question that I do not have an answer to, and need an answer that satisfies me. |

Green function are imprtotant tools part of every physicists arsenal. They appear every where fron electrodynamics to optics and fluid dynamics andto quantum field theory. Here is an extract briefly describing his times. He entered Cambridge as graduate student at the age of 40.

In this blog I share my sceme of creating problems and assessment for teaching and evaluation.

In a particle physics text book "Elementary Particles and Their Currents" written in 1968, the author, Jermey Bernstein concludes the book by

writing

"Birth of Quantum Mechanics" by Jagdish Mehra

A delightful lecture by Jagdish Mehra, later published as CERN Report in 1976, gives blow by blow account of how Heisenberg's ideas developed and what his contemporaries thought about his works. This report is being made available to everyone as an attachement here.

REFERENCE

Jagdish Mehra, "Birth of Quantum Mechanics ", Heisenberg Memorial Lecture ( March 30, 1976), Published as CERN Report 76-10

In this blog I take you to an original argument in the book, by Landau Lifshitz's on Qunatum Mechanics, about using uncertainty principle to determine if the number of bound states for a potential will be finite or infinite.

When did you first come across a serial some where? You may or may not remember, but I do.

Dear student friends,

I have earlier contacted you regarding your plan during winter vacations. Many of you have been

asking about the work to be done. If you can spare time and energy, please create an account and

sign in http://0Space.org. Leave a message as a comment/reply to this page.

The message should have information about the days you will be available in HCU.

Depending on repsonse by SFs and your availability now and in Jan, Feb 2014, the activity

for each SF will be finalized.

Best wishes for your onging examinations.