Lecture 3 - Topics for the day Administrative stuff...

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Topics for the day Administrative stuff Photoelectric effect Particle nature of light Wave nature of light Wave-particle duality Administrative stuff DrRuth’s ofFce hours OfFce hours survey in the Assignments section of BB Only 23 responses by this morning - not enough Respond by 5 pm Tuesday to be considered ALEKS Prep chemistry assessment (5% of grade) Must Fnish initial assessment by next Wed (2/3/10) Need to pass 70% of topics by 3/29/10 Tell your % from the number of topics Can continue work to improve this % Administrative stuff Homework = Course ALEKS + Quest (10% of grade) To access Course ALEKS you need a course code Pay $40 online when you start it I’ll give the course code out next Wed (2/3) You can get it and start early if you’re 70% prep ALEKS Course ALEKS is on new stuff, not prereqs. The Frst assessment is HARD. You are not expected to know this stuff when you start. 1 2 3
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A. Less than one year, or IPC only B. One year C. More than one year D. AP chemistry (select this even if others are true too) How much chemistry did you take in high school? iClicker Time A. Too much, too fast B. Seemed ok C. Way too slow D. Was there a lecture last week? The coverage and content of last week’s lecture was iClicker Time A. Radio waves B. X-rays C. Ultraviolet light D. Gamma rays E. Infrared rays Which has the highest frequency (shortest wavelength) ? iClicker Time 4 5 6
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Where were we? A Black body radiator is a theoretical way to model the intensity and wavelength emission given off by something as it is heated to very high temperatures. 5000 K 7000 K Planck was able to successfully predict the experimental observations using this formula: Δ E = nh ν where Δ E is the change in energy, n is an integer, ν is frequency, and Planck’s constant h = 6.626 × 10 –34 J s Planck’s theory included the radical new idea that energy can only be changed by discrete amounts, known as quanta . We say that energy is
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Lecture 3 - Topics for the day Administrative stuff...

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