Recent content by astrophysics12

Why does a large number of identical particles randomly distributed produce a diffraction pattern same as that of a single particle?

Homework Statement A rigid uniform horizontal wire PQ of mass M, pivoted at P, carries a constant current I. It rotates with a constant angular speed in a uniform vertical magnetic field B. If the current were switched off, the angular acceleration of the wire in terms of B, M and I would be...

Thanks a lot. I got it. This is actually from a question paper that I was practicing.

Homework Statement A solid metallic cube of heat capacity S is at temperature 300K. It is brought in contact with a reservoir at 600K. If the heat transfer takes place only between the reservoir and the cube, the entropy change of the universe after reaching the thermal equillibrium is A...

I got it. Thank you. I made the mistake of including F even for the second blockSystem: Second Block(behind) T=ma System: First Block(Front) F-T=ma F=ma+T F=2ma F/2=ma Hence, T=F/2 Thanks, again

I did draw a free body diagram. I don't know how to draw it here. Is there some way where I can upload it? I will do it again. Thanks

Homework Statement Two blocks of equal mass m are tied to each other through a light string. One of the blocks is pulled along the line joining them with a constant force F. Find the tension in the string joining the blocks. Homework Equations I tried doing this by this method. (I don't know...

Thanks. The side should be 4/√3

r is the radius of the atom. Volume unoccupied is the free volume. It is the difference between total volume of cubic cell and the volume occupied by the atoms. Am I right?

Homework Statement The fraction of volume unoccupied in the unit cell of the body centered cubics lattice is? Homework EquationsThe Attempt at a Solution I got the volume occupied by the atoms as (8/3)πr3. I am not sure if it is right. I just assumed that all the atoms were of same element. I...

Thanks a lot. I will try solving difficult problems.

I want to be a physicist. It has always been my dream, but I am having doubts about my ability. I am preparing for a few competitive exams to get into good colleges offering Int-PhD. I found that I am unable to even solve some of the problems. It becomes obvious when I see the solution. Is...