# Search results

1. ### Deriving the dielectric constant of water

We derived a formula to calculate the dielectric constant for some materials. It works well for gases and some liquids. But, water has a extraordinary dielectric constant of ~80. I tried googling it up but couldn't find any place which explains (mathematically) why it's so big. The professor...
2. ### Why do QM particles with l<S vanish in a classical radiation field?

Off pg 977 MTW Gravitation : Consider a classical radiation field whose associated quantum mechanical particles have integer spin S, and zero rest mass. Resolve that radiation field into spherical harmonics - i.e. into multipole moments. all components with l<S will vanish; in general those...
3. ### Suggestions for places for M.Sc. Interested in astro-cosmo

Hey guys. I'm in third (final) year of my B.Sc. in physics. Have done/will be doing courses like Relativistic QM, intro to QFT, GR, condensed matter, etc. I am interested in astrophysics and cosmology and have done some work on it under a prof during vacations. But, my CGPA is on the lower...
4. ### Creating an acoustic black hole

http://www.newscientist.com/article/dn17319-physicists-create-black-hole-for-sound.html" The team cooled 100,000 or so charged rubidium atoms to a few billionths of a degree above absolute zero and trapped them with a magnetic field. Using a laser, the researchers then created a well of...
5. ### Watching young's double slit experiment in moving frame

Suppose an observer is moving at some constant velocity(<< c) and observing the young's double slit experiment. What changes will it observe compared to an observer at rest? This is what i could make out : 1) The wavelength of incoming light will change (doppler effect) 2) By the intuition...
6. ### Calculating generator function in canonical transformation

I'm searching for an example of how to find out generator function for a canonical transformation, when new canonical variables are given in terms of old variables. Any help is greatly appreciated.

I'm making a question paper with answers having multiple options. I made/got the questions and right answer, but I'm unable to get wrong answers. Please people try to make some basic level mistake to get a wrong answer and tell me (Pardon me if I've posted this in wrong place) 1) Find the...
8. ### LaTeX Wrapping multiple figures with text in latex

How to wrap more than one figures with text in latex?
9. ### Potential/self energy of a charged spherical shell

What is the potential energy of a uniformly charged spherical shell; i think it is called the self energy of shell.
10. ### Circuit which stops other switches to work asa one switch is pressed

I have to make a circuit which works like this : I'll have some buzzers (just bulbs which glow when switch is pressed); as soon as one buzzer is pressed, others stop working till the first switch is released. I don't have an experience of making circuits, except the easiest ones made in school...
11. ### Feynman lectures volume II - how is it?

I'll be studying electromagnetism next sem (January) and I thought reading Feynman before the proper start of course will be useful, but Feynman himself said( in the preface) that he did not do much creation in vol II. So, is there any other Feynman sort of book on electromagnetism or I should...
12. ### II order homogeneous differential equation solution

I am trying to solve the diff. equation - a\frac{d^{2}x}{dr^{2}} + (br + c/r)\frac{dx}{dr} + dx = 0 I got it while solving a variant of damped harmonic oscillation. Any hints (Frobenius method won't work)
13. ### Example of basis construction

I learnt that given a vector space we can construct a basis for it. Can anyone give me an example of this thing (except the trivial example of 2-D and 3-D euclidean space.)
14. ### Newton's Law of gravitation using kepler's laws.

Homework Statement Derive Newton's Law of gravitation using kepler's laws. Homework Equations Kepler's law equations. etc. The Attempt at a Solution l= r(1- e*cos(theta)) l- const. e- eccentricity Solving these equations using kepler's laws (r^2(d(theta)/dt), etc.)...
15. ### Role of pitch in swing and seam movement of cricket ball

Recently I attended a lecture related to the physics behind swing of cricket ball. But the speaker dealt with the swing before pitching(and dealt loosely with late swing). He took only the effects of air in consideration. I am interested to know how the pitch effects the swing(or seam movement)...
16. ### Programs Doing Master degree in US

This year I'll join B.Sc.(Hons) Physics. Its a 3 year course. I've heard that for doing a master degree in US requires 4 years of study. Will I be able to do master deg in US.
17. ### Gravitational lensing

I read that when a galaxy comes in the path of light coming from a quasar, its path bends slightly resulting in the formation of a giant luminous arc (called einstein ring). The phenomenon is called gravitational lensing. Can someone tell me something more about gravitational lensing ? Please...
18. ### Organic chemistry problem

Homework Statement What is the product when 1,1,4,4-tetra D cyclohexane is treated with SO2Cl2 The Attempt at a Solution I'm confused whether Cl will replace D or H (it must replace any one of them)
19. ### Aldehyde in aqueous base

Homework Statement In aqueous base, 97% of 2,2-diphenylethanal is present as a species different from the aldehyde, enol or aldol addition or condensation products. What is this species? Please also try to explain the mechanism. Homework Equations The Attempt at a Solution...
20. ### Nucleus having only neutrons ?

Can we have a nucleus containing neutrons alone? Thanks in advance.