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38 deBroglie

# 38 deBroglie - Logistics On-line course...

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Craig Ogilvie Logistics § On-line course evaluation (ClassClimate) Available till Monday 8am finals week Greener solution + saves staff time typing comments § Feedback is vital Please respond 11

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Craig Ogilvie Summary Lecture 37 § Two distinct, far point sources, can you tell their images apart ? if large qob, two separate diffraction peaks each image is not a point but a diffraction pattern,width qD q o b D Two images formed on screen near focus of converging lens move two sources closer smaller qob, e.g. image of second source sits at diffraction minimum of first still smaller ob θ cannot resolve two separate diffraction peaks
Craig Ogilvie Goal § Introduction to quantum physics § Photon: energy transported by light comes in finite, small amounts § Wave characteristics of all moving objects 33

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Craig Ogilvie 44 Photoelectric Effect: pre-lecture video + Tue rec. φ φ - = hf hf KE electron , max for all materials slope of the line is always Planck’s constant, h=6.626 × 10-34 Js f is the work function depends on material Interpretation (Einstein) all the energy of photon (E=hf) given to electron during collision costs some energy (work function f) for electron to leave atoms Electrons emitted when light shines on metal
Craig Ogilvie 55 Question: Increase brightness, 1st round § If the frequency f is below cut-off, increase brightness of light § What happens is …. 1. electrons escape from metal because increasing intensity, increased strength of E-field, larger acceleration of electrons => escape from atom 2. photon still has same energy, there are more single photon- electron collisions but each has insufficient energy to knock electron out of atom => no electrons knocked out 53 of 340

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Craig Ogilvie 66 Question: Increase brightness, 2nd round 6% 94% 13% 87% 1 2 § If the frequency f is below cut-off, increase brightness of light § What happens is ….
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38 deBroglie - Logistics On-line course...

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