H2 physics

• penguin10101

  6 Nov 11, 02:08

  anyone knows 1) why young's double slit equation can only be used for EM wave?

  2) why uncertainty of momentum can approx to momentum in heisenberg uncertainty principle?

  Thanks! :)

• eagle

  6 Nov 11, 23:13

  1) Young's Double Slit experiment is an application of Two Sources Interference. Young did it using light waves.

  2) I don't understand what you mean by your question, specifically the word approx. Heisenberg's Position-momentum uncertainty is a law of physics.

  In case you are thinking of uncertainty in Chapter 1 of Physics, Measurements, there is no link. Chapter 1 talks about uncertainties due to imperfections of human measuring equipments.

  Uncertainty principle is about the fundamental law of physics, and does not happen due to any inabilities of humans or any measuring equipments at all.  It is an extension of the wave-particle duality, but exactly how is way out of the scope of A level syllabus.

• wee_ws

  7 Nov 11, 05:54

  Hi penguin10101,

    I believe that your second query comes from H3 Physics?

    This reference may help you:

    http://www.scribd.com/doc/65014875/Modern-Physics-3rd-Edition-Serway

    Thanks!

  Cheers,
  Wen Shih