PHYS-1150 (6)(Kaldon-40451) Name ________________________________________ 1150WMU Fall 2007Topic 2 / Worksheet 1 – 25,000 points Section: 6a 6b 6c 6dSee website for additional comments. A to D E to L M to R S to Z Rev. 11/20/07Electrical Power(Assigned: 20 November 2007 • Due: Tuesday 4 December 2007)I. It is the Year 2007, and while we do not have Moon colonies, personal hovercraft, or robotic maids andvalets, we do have a lot of electrical gadgets. During the course of a typical school day (Monday-Friday), makea list of all the electrical devices you use during that day (up to a maximum of 12 items – if you have more than12 items, we prefer the ones that use more power or more time). On the back of this sheet is a handy fill-in-the-blanks table to make this easy to calculate. Then separately count up “large”, “medium” and “small” lampsthat you are likely to use around the house. Specify your criteria. Example: Large might be a halogen floorlamp or big fixture of 300 W to 500 W. Medium might be a 3-way light bulb or a fixture with multiple bulbstotally 100 W to 200W. Small might be 25 W to 60 W single light bulbs. Ignore little 7W nightlights.Estimate a single number to indicate how long you keep the lights on during this season – say an average of 5hours? Then multiply the total lamp counts by say 400 W, 150 W and 50 W (L, M and S) to add to your totalsfor Watts.II. Estimate how many Joules of energy that your use of the items in (I) entailed.III. We seem to be moving into a period of more and more unstable weather. Despite our dependence onelectrical devices, our electrical power system is aging and getting more chaotic. So lots of people are buyingemergency generators. One rule for figuring out how big a generator you need to get is to add up the wattagesof all the critical devices (refrigerator, furnace, water pump if you have a well), plus the wattages of thosedevices you have to use all the time, then multiply by 150 % ( × 1.5 ). How big a generator do you need?Worksheet 1 WorksheetItem Watts Minutes Seconds Joules1.2.3.4.5.6.7.8.9.10.11.12.Total Watts: _____________ Total Joules: _____________Lamps:SmallMediumLargePHYS-1150 (6)(Kaldon-40451) Name ________________________________________ 1150WMU Fall 2007Topic 2 / Worksheet 2 – 25,000 points Section: 6a 6b 6c 6dSee website for additional comments. A to D E to L M to R S to Z Rev. 11/20/07Frequency and Wavelength(Assigned: 20 November 2007 • Due: Tuesday 4 December 2007)I. For your hometown, what channel is your local PBS station? (If your hometown is not in the United States,use the channel for Kalamazoo/Grand Rapids.) We need the broadcast channel number, not the channel numberthat it might be located on your cable TV. For example, in Allendale, PBS is on cable channel 12, but that is notthe answer we want here. Next, find out what frequency, f, the visual and audio signals for that channel numberare broadcast at. Finally, turn those frequencies into wavelengths, l in meters, and tell us what kind of EMwaves these are. How can you know what frequencies go with what channel numbers? I dunno – they’restandardized for the U.S. Try Ask.com, Google or use some other search engine on the Web, for one.II. Visible light falls between about 400 nm and 750 nm. A pure bright yellow or red-orange color might be l= 670nm or l = 555 nm. Which is which? And what is the frequency of these two pure colors?III. In the thrilling bound volume, An Ab Initio Study of the K-a Spectra of Lithium Ions in Lithium Halides(LiX), A Thesis for the Degree of Masters of Science in Physics, Michigan Technological University, PhilipEdward Kaldon, 1988, the not-yet-Dr. Phil writes about photons which have an energy of 60.9 eV. Given that1 eV = 1.602×10-19 J and for photons, E = h f, where h is Planck’s constant (it’s probably inside of the front orback book cover of your text) – find the frequency f and wavelength l of a 60.9 eV photon, and show that it fallssomewhere near the border between X-rays and UV.PHYS-1150 (6)(Kaldon-40451) Name ________________________________________ 1150WMU Fall 2007Topic 2 / Worksheet 3 – 25,000 points Section: 6a 6b 6c 6dSee website for additional comments. A to D E to L M to R S to Z Rev. 11/20/07Optics Observations(Assigned: 20 November 2007 • Due: Tuesday 4 December 2007)I. Mirrors • Try as you might, you cannot see behind your head with a single plane mirror. Position yourself infront of a mirror at any angle q other than q = 0°, which would be normal to the surface. Now turn you headuntil you can see your eyes. If you want to stare at the space in between your eyes, while your eyes face straightahead, what angle q is this? Does this make sense? Is there any other angle you can do this with a single planemirror?II. Find a drinking glass that is (a) made of clear glass, (b) has relatively straight sides so that it is nearly acylinder. Look through the glass under the conditions A=empty and B=filled with water. Describe the imagesthat you see. Repeat with a spoon in the glass, resting at an angle. Raise your head so you are looking down atthe top surface. Describe what you see.III. The Blind Spot • The human eye is a remarkable instrument. But it does have flaws. For some people,these show up in being nearsighted or farsighted, or other vision problems up to and including no vision at all.There is speculation that some of the Impressionist painters had vision problems, which explains the blurryswirls of all the colors and no discernible detail. In this part we want you to locate your “blind spot”. This iswhere your optic nerve attaches to the retina and there are no rods or cones. You don’t normally notice thisbecause your brain “fills in the blanks” by putting a similar adjacent pattern over the “hole”. You will needsomeone to help you. Close your left eye and center the dot “ • ” below directly ahead of your right eye. Movethe paper slowly forward and back, all the time staring at the dot. At some distance, the cross “×” will seem todisappear. Have your assistant measure the distance roughly from the tip of your nose to the page. Turn thissheet around 180° and repeat for the left eye. Are the distances the same?––––– • –––––– × –––––––PHYS-1150 (6)(Kaldon-40451) Name ________________________________________ 1150WMU Fall 2007Topic 2 /