1. timemachine2

    Can any INVISIBLE EM waves get electrons in solid matter, to the same energy levels i

    n glass. As they pass through the solid opaque matter. So as Invisible EM waves like radio, X-rays, and gamma waves pass through say a 4 inch cubic block of black solid carbon. Do you think by mixing EM waves, and reducing, or increasing frequency, and wavelength you could get the electrons...
  2. timemachine2

    Can you explain how light would behave as it passes through solid opaque matter in th

    -is specialized way by mixing light EM wavelengths. So you want to get solid opaque matters electrons to the same electron energy levels of glass. You use any EM, or laser light (with more intensity) to get the electrons in the solid matter to the same energy levels as glass. So for the first...
  3. timemachine2

    How much does light penetrate through a solid material in microns.

    How much does light penetrate through a solid material in microns. There more than a million atoms in the width of a human hair, so with...light shining on the hair how many single atoms in a line, would the light traverse through, or maybe the better word to use is scatter through. The light...
  4. I

    Would any solid element be invisible/transparent if you could stop electrons from abs

    Would any solid element be invisible/transparent if you could stop electrons from absorbing, and emission light photons. So try to imagine light basically just passing through a solid element through the atoms, but there are no electrons, orbiting the atoms, or you could somehow stop the...
  5. timemachine2

    In this experiment by mixing EM, with light, could any solid element, become transpa

    -rent like glass. ;DLight does not have the energy to excite electrons in glass. So take any other opaque element hit it with UV rays, or any other EM radiation, whatever works best to excite the electron to the energy/shell level that will not excite RED light. Then mix the EM wave you used...
  6. timemachine2

    How does light interact, and travel through Solid matter as matter gets thicker, in w

    How does light interact, and travel through Solid matter as matter gets thicker, in width.? In the absorption, and emission process of light, hitting electrons, I do not really understand that much, about electron energy levels, and how they change when a lot of atoms become molecules, and...
  7. timemachine2

    Does anybody know the energy shells eV for glass, and SOLID carbon

    Glass does not absorb any light, exept UV. but what is the eV for the glass electron to get excited and leave the ground state, and move up to shell level 2, or energy band 2. Also when carbon electrons are in the ground state, how much eV from light or any other EM radiation does it take for...
  8. J

    Help Deriving Moment of Inertia of Solid Sphere (Where did i go wrong?)

    I am attempting to derive the moment of inertia for a solid sphere by summing an infinate amount of thin spherical shells instead of disks. Sphere has radius R Shells have radius r and thickness dr I=sum(mr^2) = integral(r^2dm). to sub out dm in terms of dr, p=m/v so pdv=dm. dv of a shell...
  9. E

    Thermal expansion of a solid body

    Hello, I suddenly feel quite confused with the simple equation of a body length (1d case) after being exposed to a temperature difference : L_final=(1+alpha*dT)*L_initial while dT is the temperature difference I try to use this equation twice - 1. I want to find the length of a body...
  10. S

    Ice skater and solid cylinder questions

    (Wondering)(a) An ice skater with an initial moment of inertia of 1.34 kgm2 with arms outstretched horizontally is initially spinning at 9.10 revs/s. She draws her arms vertically in by her side reducing her moment of inertia to 1.25 kgm2. What is her new angular velocity...
  11. N

    Solid immersed partially in a liquid

    Suppose an object(spherical) is kept in water and 9/10 of the object is inside the water 1/10 floats. Find the weight of solid inside liquid. By Archimedes principle, if an object is immersed in a fluid, it experiences an apparent loss of weight which is equal to the weight of fluid...
  12. M

    x-ray applications in solid state physics

    hello everyone i want to do some research on the applications of x-rays in solid state physics and i need help in finding comprehensive materials.i have started working on it but i still feel i have not gotten something very convincing. any help would be appreciated.thanks
  13. N

    matrix in solid state physics

    Hi, everyone! Can anyone answer me the size of dynamical matrix, harmonic matrix of 1-D monoatomic chain with 16 atoms (in real space and reciprocal space respectively)? Thanks!
  14. B

    Lagrangian density of linear elastic solid

    I need the general expression for the lagrangian density of a linear elastic solid. I haven't been able to find this anywhere. Thanks.
  15. S

    Why is it difficult to walk on solid ice?

    How can we explain the difficulty of walking on solid ice using the principle of friction?
  16. E

    Field within a solid sphere.

    Hi: Consider a solid sphere and a point within it. Is the gravitational field at this point due to the sphere the same as if all the mass of the sphere were concentrated at its center? I have tried to make the integration (surfice integral, working in two dimensions) but I have obtained g= 2...
  17. A


    Determine the total area of the button solid figure
  18. J

    solid state

    A thin straight copper wire of length 2 m is cooled to 100 K. At this temperature the electrical conductivity is 2.87 x 10^8 ohm^-1 m^-1, and the hall coefficient is -5.5 x 10^-11 m^3 C^-1. A voltage difference of 30 mV is applied between the ends of the wire, and a magnetic field of 0.2 T is...