1. S

    Usage of absorption and magnitude mode spectra

    In nuclear magnetic resonance, when should one process spectra in absorption mode and when - in magnitude mode? What is benefit of using the first one and the second one? For example, I need to integrate spectrum. In this case, what should I use - absorption or magnitude mode?
  2. Z

    Heat absorption in reversible isothermal expansion

    2kgs (total mass) of steam goes through a revesible isothermal expansion at 500 degrees celcius. During the expansion the pressure drops from 300 kpa to 200 kpa What is the heat absorbed by the steam during this process? I guess that steam cannot be assumed to be ideal which makes the...
  3. O

    Temperature Increase due the radiation absorption

    Hello Everyone, I am trying to understand how to calculate the temperature increase due to the absorption of radiant energy by an object that can be approximated by a blackbody (emissivity and absorptivity close to 1). As radiant energy is being absorbed, the body temperature increases until...
  4. N

    How to design a CSP receiver pipe (acting as a generator for Vapor absorption system)

    Hello everyone, I am an Engineering student currently working on a project. The project is to design and fabricate CSP (concentrated solar power) based vapor absorption refrigeration system. I hope everyone here knows about vapor absorption system and its components. The problem that led...
  5. timemachine2

    Could mixing light wavelengths effect absorption, and emission process.

    The electron when hit by light moves to a higher shell level very briefly, to either shell 1, or 2 depending on the energy of the light wavelength. So because you mixed any EM radiation, with red light which has the lowest energy, could when light, or other EM waves gets absorbed, and the...
  6. M

    Need help with: Absorption of electrons/photons

    Hello! I'm not an english speaker, but I really need help with a question. I'll try to translate it as best as I can. Explain what happens when an electron with kinetic energy=1.12aJ collides with a simple mercury atom. What happens if a photon with the energy 1.12aJ collides with the atom...
  7. kelsiu

    Radiation emission and absorption

    Any object can emit and absorb radiation and the power of emission can be represented by the Stefan-Boltzmann law: P=AεσT^4 In many texts the net power radiated is the difference between the power emitted and the power absorbed: Pnet=Aεσ(T^4-Ts^4) where Ts is the temperature of...
  8. S

    practical application of lambert's law with hydrogen gas

    I'm designing a device i can use to count hydrogen molecules using Lambert's law. Can anybody point me in the direction of a good resource where i can get tabulated data on the absorption co-efficient of Hydrogen gas at different frequencies.
  9. C

    absorption spectra of atoms

    Hi everyone, I've been asked to explain how it is possible to determine the local magnetic field in a distant star by examining the absorption spectra of atoms contained within it. I've read through the lecture notes and searched around online but cant find a proper explanation of it, an help?