Physics

Physics

1. Quantum

   • Electron Volt (eV)
     • One eV is when one electron moves with a p.d of 1 volt
       • Example
         • 3 electrons with p.d of 1 volt is 3eV or 1 electron with a p.d of 10volts is 10eV
       • W = QV
     • energy in Ev = energy in joules / 1.6x10-19
   • Photons
     • Planck Constant
       • eV = hf
       • plancks constant is the ratio between the energy and frequency
       • 6.63 x 10 -34
     • The energy of a photon is directly proportional to the frequency of the radiation
       • E = hf
         • h is planck constant
     • A packet / quantum of light.
     • Light
       • Light is a wave when it diffracts
       • Light is a particle when it reflects
       • When light hits a wall the energy is asorbed into an electron this electron then jumps from it's current shell into the next shell. It then releases that energy and drops back into the previous shell.
   • It's the smallest amount of energy needed for an interaction. It's an indivisible quantity, so can have it all or none.