Exam 2 Practice Problems

Exam 2 Practice Problems - photons fall on a square meter...

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Physics 6 Spring 2005 Some Practice Problems for Exam 2 Answers will be posted Monday 1. What is the probability of getting only 2 heads in 4 tosses of a coin? 2. What is the probability of getting at least 2 heads in 4 tosses of a coin? 3. Consider 4-sided dice . a. What is the probability of getting exactly 2 number 3's in 4 tosses? b. What is the probability of getting at least 2 number 3's in 4 tosses? c. In two rolls of the 4-sided die, what is the probability that the second roll will have a higher number than the first? 4. The sun is about 92 million miles or 150 million kilometers away from the earth. The peak wavelength of sunlight is about 5.1x10 -7 m . a. How long does it take for the sun's light to get to the earth? b. Take the peak wavelength to be the average. At the earth sunlight imparts EM power of about 700 Watt/m 2 . How many photons fall on a square meter in 1 second?
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Unformatted text preview: photons fall on a square meter in 1 second? 5. Electrical wires connected to a wall plug (in the US) emit EM radiation of frequency 60 Hertz. a. What is the wavelength of that radiation? Is it visible? b. What is the energy of one photon emitted? 6. A proton travels at (1/300)c. What is its deBroglie wavelength? Mass of the proton is 1.67x10-27 Kg. 7. A hydrogen atom undergoes a transition from the n=5 to the n=2 state. What is the wavelength of the photon emitted? Is it visible? 8. An electron is confined to a microscopic tube of length 10-8 m. What is the best precision, i.e. the smallest uncertainty with which its momentum and velocity can be measured? Mass of electron is 9.11x10-31 Kg. 9. One day 2 inches of rain fell in the Boston area. How many gallons of water fell on the Tufts campus? (This is an estimation problem.)...
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