Notice of first test. Please be notified that we will hold our first test on 16 Jan 2004, Friday, 5.00 – 5.50 pm (which was previously scheduled for the 3rd tutorial).
These are very energetic EM radiation called gamma rays and are found in nature as one of the emissions from radioactive nuclei and in cosmic rays.
e+ + e-g + g
Initial energy = 2mec2 + K
Conservation of relativistic energy:
2mec2 + K = 2 hc/l
In short the identity manifested by light depends on what it “sees” (which in turns depend on its own wavelength) in a given experimental condition
Microscopic matter particle (such as electron and atoms) also manifest wave-particle duality
This will be the next agenda in our course
Prince de Broglie, 1892-1987
is pictured as a wave
Matter wave with de Broglie wavelength
l = p/h
Particle with linear momentum p
BUT why is the wave nature of material particle
h / (2meK)1/2 = 1.65 Angstrom