Recent content by astrophysics12

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    Graduate Diffraction pattern for large number of particles

    Why does a large number of identical particles randomly distributed produce a diffraction pattern same as that of a single particle?
    • astrophysics12
    • Thread
    • Diffraction Diffraction pattern Number of particles Particles
    • Replies: 6
    • Forum: Optics
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    Calculating angular acceleration of a wire

    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...
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    How Is Entropy Change Calculated in a Heat Transfer Problem?

    Thanks a lot. I got it. This is actually from a question paper that I was practicing.
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    How Is Entropy Change Calculated in a Heat Transfer Problem?

    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...
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    What Is the Tension in the String Connecting Two Blocks of Equal Mass?

    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
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    What Is the Tension in the String Connecting Two Blocks of Equal Mass?

    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
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    What Is the Tension in the String Connecting Two Blocks of Equal Mass?

    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...
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    Unit Cell Problem: Find Volume Unoccupied | Help Solving Entrance Exam Question

    Thanks. The side should be 4/√3
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    Unit Cell Problem: Find Volume Unoccupied | Help Solving Entrance Exam Question

    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?
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    Unit Cell Problem: Find Volume Unoccupied | Help Solving Entrance Exam Question

    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...
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    What am I supposed to do to be better than what I am now?

    Thanks a lot. I will try solving difficult problems.
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    What am I supposed to do to be better than what I am now?

    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...