Caroline Chisholm College Physics

1. Caroline Chisholm College Physics 3. Limitations of past technologies and increased research into the structure of the atom resulted in the invention of transistors

2. Caroline Chisholm College Physics Light has wave and particle characteristics DeBroglie proposed that electrons should have a wave-like nature He used E=mc2 and E=hf to give: mc2 = hf i.e. mv2 = hf i.e. (mv)v = hf i.e. pv = hf i.e. v = hf/p v = fl l = v/f = hf/pf = h/p = h/mv etc... 6th energy level = 6 wavelengths He imagined circular standing waves when 5th energy level = 5 wavelengths whole multiples of wavelengths = circumference and applied this to electrons in orbit around the nucleus Bohr: Electrons orbit in circular motion, stable, non-radiating orbits. Atoms emit and absorb radiation in quantised amounts, corresponding to energy levels. 4th energy level = 4 wavelengths 3rd energy level = 3 wavelengths 2nd energy level = 2 wavelengths de Broglie’s standing wave pattern of vibration with whole number of wavelengths is necessary for stability so that an orbit will not destructively interfere with itself 1st energy level = 1 wavelength An electron can * absorb a quantum of energy higher standing wave energy An electron can * release a quantum of energy lower standing wave energy