solution_pdf1
2 Pages

solution_pdf1

Course Number: PHY 44135, Spring 2009

College/University: University of Texas

Word Count: 571

Rating:

Document Preview

McPartlin (anm464) assignment 10 frommhold (58025) This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 16.66 points If we continue heating a piece of initially room-temperature metal in a dark room, what will be its first visible color? 1. Red correct 2. There will be no color at all. 3. Violet 4. White Explanation:...

Unformatted Document Excerpt
Coursehero >> Texas >> University of Texas >> PHY 44135

Course Hero has millions of student submitted documents similar to the one
below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

Course Hero has millions of student submitted documents similar to the one below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

(anm464) McPartlin assignment 10 frommhold (58025) This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 16.66 points If we continue heating a piece of initially room-temperature metal in a dark room, what will be its first visible color? 1. Red correct 2. There will be no color at all. 3. Violet 4. White Explanation: The metal glows at all temperatures, whether we see the glow or not. As its temperature is increased, the glow reaches the visible part of the spectrum and is visible to human eyes. Light of the lowest energy per photon is red, so the heated metal passes from infra-red (which we cannot see) to visible red. keywords: 002 16.66 points Solar radiation falls on Earth's surface at a rate of 1100 Watts/m2 W/m2 . Assuming that the radiation has an average wavelength of 580 nm, how many photons per square meter per second fall on the surfaces? Correct answer: 3.21 1021 photon/m2 s. Explanation: 1100 Watts/m2 hf 1100 Watts/m2 = hc/ (1100 Watts/m2 ) 580 10-9 nm = (6.63 10-34 J s) (3 108 m/s) = 3.21 1021 photon/m2 s . keywords: 003 16.66 points 1 Which of the following metals will exibit the photoelectric effect when light with a frequency of 6.8 1014 Hz frequency is shone on it? a. lithium, hft = 2.3eV b. silver, hft = 4.7eV c. cesium, hft = 2.14eV 1. Cesium 2. Lithium and silver 3. Silver 4. None of these 5. Lithium 6. Lithium and cesium correct Explanation: = 6.8 1014 Hz , = 2.3 eV , = 4.7 eV , = 2.14 eV , and Let : f hft,lithium hft,silver hft,cesium h = 6.63 10-34 J s . For photoelectrons to be emitted, h f must be greater than h ft . hf = (6.63 10-34 J s)(6.8 1014 Hz) 1.6 10-19 J/eV = 2.81775 eV which is greater than the work functions of lithium and cesium, and therefore causes photoelectrons be to emitted by these metals. 004 16.66 points A ball has a mass of 0.271 kg just before it strikes the Earth after being dropped from a building 39.2 m tall. What is its de Broglie wavelength? The acceleration of gravity is 9.8 m/s2 . Correct answer: 8.82096 10-35 m. Explanation: McPartlin (anm464) assignment 10 frommhold (58025) From conservation of energy 1 m v2 = m g h 2 v= 2gh = 2 (9.8 m/s2 )(39.2 m) so keywords: = 27.7186 m/s , 2 so the atom will be ionized and its kinetic energy will be K = 106.885 eV - 13.6057 eV = 93.2797 eV . p = m v = (0.271 kg)(27.7186 m/s) = 7.51174 kg m/s , and = h p 6.62607 10-34 J s = 7.51174 kg m/s = 8.82096 10-35 m . keywords: 005 16.66 points Suppose that a hydrogen atom in the ground state absorbs a photon of wavelength 11.6 nm . If the atom is ionized, what will be the kinetic energy of the electron when it gets far away from its atom of origin? The value of h is 1.05457 10-34 J s ; the speed of light is 2.99799 108 m/s ; the value of h is 6.62607 10-34 J s ; the Rydberg constant for hydrogen is 1.09735 107 m-1 ; the Bohr radius is 5.29177 10-11 m ; and the ground state energy for hydrogen 13.6057 eV . 1 eV = 1.60218 10-19 . Correct answer: 93.2797 eV. Explanation: Let : c = 2.99799 108 m/s , h = 6.62607 10-34 J s , E0H = 13.6057 eV , and = 11.6 nm = 1.16 10-8 m . c hf = h = (6.62607 10-34 J s) 2.99799 108 m/s 1.16 10-8 m 1 eV 1.60218 10-19 J = 106.885 eV , 006 16.7 points Determine the wavelength of an electron in the third excited orbit of the hydrogen atom, with n = 4. Correct answer: 1.32952 nm. Explanation: Let : n = 4 . L = me vn rn = n h h me vn n2 a0 = n 2 h p = me vn = (2 a0 ) n Thus, the de Broglie wavelength of the elech tron in the nth orbit is = = (2 a0 ) n. pn For n = 4, this yields = 8 a0 = 8 (0.0529 nm) = 1.32952 nm .

Find millions of documents on Course Hero - Study Guides, Lecture Notes, Reference Materials, Practice Exams and more. Course Hero has millions of course specific materials providing students with the best way to expand their education.

Below is a small sample set of documents:

University of Texas - PHY - 44135
McPartlin (anm464) assignment 9 frommhold (58025) This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 16.66 points Assume that a camera has a fixed focal
University of Texas - PHY - 44135
McPartlin (anm464) assignment 8 frommhold (58025) This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering.S11y dS2001 16.66 points Consider the setup of a
University of Texas - PHY - 44135
McPartlin (anm464) assignment 7 frommhold (58025) This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 16.6 points Hint: The convergent lens in this probl
Concordia Canada - MATH - 209
American University in Bulgaria - ECONOMICS - 402a
Eco 402aProf. J. Nilsen Final Examination December 20, 20071True/False/Uncertain 6 points each. Credit will be given mainly on the strength of the logic justifying your response. Limit your answer to one or two sentences. 1. According to Milton
Texas A&M - THAR - 281
Travold doesn't see Nora as an equal Travold call hers nicknames, which end up degreading her They have a good life, house, children Travold o Has control over her o When he finds out he is blackmailed b Krog, he blames everything on Travo
Texas A&M - THAR - 281
American Theatre preWorld War II o From 1900=1940 o Realism had set in and people expected plays to have realistic settings o 1915 America catches up. We get all the innovations that Europe already had. We get all the artistic inovation Theath
Texas A&M - THAR - 281
Erwin Piscator Was a German director. Very influentional in Berlin, which was a hot bed of art at the time o developed concept 19241927 o Offshoot of Expressionism External reality can be changed o Proletariat theatre A theatre for the wor
Texas A&M - THAR - 281
The civilization of china can be traced back to 2000 BC Dynasties of ruler (hereditary rules) o Starting around 1700 BC First dynasties ruled for about 600-800 years . There is a sense in the China where all Chinese believe that China always is.
Texas A&M - THAR - 281
England is just coming out of the Middle ages. It is just starting to have it's renaissance Renaissance in italy mid1300s In England 1485 o End of the war of the Roses o Henry (VII) Tudor is King It takes 80 years for the Roses to e
Texas A&M - THAR - 281
French and Neoclassical Theatre From 16001700 o Strove to recreate the ancient greek tradition. o In 1500 there was a great deal of fighting between Protestents and Catholics. o All of this fighting held back the development of the arts in Fr
Texas A&M - THAR - 281
Italian renaissance theatre Technology! Italian renaissance started in the mid to late 12-1400 o Renaissance is French for rebirth o It is a time for rediscovering arts, and moving beyond fuedaism, o Fuedalism started to die in the renaissance o Al
Texas A&M - THAR - 281
Japanese Theatre, Noh, Bunraku, Kabuki There are similarities of Japanese and Elizabethan Theatre. Even thought they never had contact. o Twenty century painters take many of the things from the Japanese into their work now Noh
Texas A&M - THAR - 281
Molier wrote about the human people, and how they didn't change over the course of their lives. He wrote about people to expose the rediculusness of people. All of his plays end with the resolution of Deux ex Machina. o In Tartuff t
Texas A&M - THAR - 281
There are two versions of Postmodernsim. The high art and the popular kind Postmodernism has taken over as a tradtional, non-resalistic, and even musical as a normal thing. What is modernism? o It is the idea that multiple theatre styles are
Texas A&M - THAR - 281
Russian realism It has the largest impact on theatre to date o The foundation of all that we know as far as acting technique and modern playwrigthing. o Centered on stanislavski and checkhovoConvergence Realism: writing as close to life as pos
Texas A&M - THAR - 281
Started around 1850 A huge reaction agaist the excess of romanticism and meloadrama. o 95% of the time, plays will be this realist plays Background o Auguste Comte came up with positivism Positivism classified all sciences according to their
Texas A&M - THAR - 281
19th century It's a classic love story The good guys are solid gold, the bad guys are horrible. The side kicks can't even rescue the people that need saving, it is always the main character. All theatre from this period are totally crap. Wh
Texas A&M - THAR - 281
The AIDS epidemic and American Theatre in the 1980s and 1990s AIDS=Acquired Immune Deficiency Syndrome o AIDS was first identified in the USA in 1981 o The epidemic has now spread to every part of the USA and to all sectors of society. o It is
Texas A&M - THAR - 281
Beckett was saying that you can't wait for, you have to help yourself. New Orleans had the best example of the play. They had full house each time they held the play. They gave out free gumbo at the beginning and then were walked to their sea
Texas A&M - THAR - 281
Ceremony: Religious, formal, or social occasion (eg. Weddings, Graduations) Ritual: The acting out of an established procedure (eg. Catholic Mass, Passover) Zeitgeist: Is a feeling about a time and place that you can not recreate. Aristotle: Ancien
Texas A&M - ENGR - 112
Homework #3 Solution 12.5 q I JV J D2 Ix J J J J AJ 2 At A x 4 JJ V 3 4Ix 42 10 A2 10000m J D2 2 J 2 1.09762 102 3 m 2 2 C2 2 JJJ V 2 2 2 2 5.82 107 2 2 2J 2s 2m 22 200V 2 2 2 2 J electron J 2 J D J 3.31cm The required wire diameter is about 3.31 cm.
Texas A&M - ENGR - 112
Homework #4 Solution 17.1 Quantity Altitude Longitude Latitude Displacement Distance traveled Heat Work Temperature Pressure Volume of the system Liquid volume within the system Liquid volume added to the system Liquid volume removed from the system
Texas A&M - ENGR - 112
Solution to Homework Assignment #4 22.1 The kinetic energy is1 K = mv 2 2 1 2000 lb m mile 5280 ft 55 = ton v ) ) )2 ~ ) 2 ) ton ) hour mile 1 = 22hour lb f ) 3600 s ) 32.174 lb m ft/s 2 ) (2( 4000 lbm ) lb f 80.67 ft ) ) )
Texas A&M - ENGR - 112
Solution to Homework 27.1 22.5 Efficiency of this unit is 98%, so the electrical power required is:& 98%Qelectrical = Qheat = r VC p D T .The volume flux is:- 3 3 3 & 2 gal 3.7854- 10 m 1min = 1.2618 10- 4 m V= min gal 60 s sand the temperatu
Texas A&M - ENGR - 112
Homework #2 Solution 12.1) [a]6 marbles 6 marbles = = 0.1( marbles / sec ) 1 min 60 sec 0.005 kg marble e 0.1 = 5 104 ( kg/ sec ) marble sec A=[b][c] D2 =< 4 4( 0.025m )24.909 10-4 m 2 marble -4 2 number flux = 0.1 4.909 10 m se
Texas A&M - KINE - 198
Communicable Diseases Transmitted from person to person o Transmission can occur by Direct transmission Coughing & Sneezingo o oTypes HIV/AIDS TBHIV/AIDS o Non-sexual contraction through blood transfusions, sharing needles, and or the ex
Texas A&M - KINE - 198
Exercise is the number one way to stop from getting the flu/cold Vitamin C can help make the cold shorter/less sever 3 oz of red meet X 4 times a week Physical Activity Recommendations o Surgeon general recommends 30 minutes of moderatiate ac
Texas A&M - KINE - 198
Hunger: Mind Games Honor your hunger Eat when your hungry Stop when almost full o Thirst Thirst and hunger cues can get mixed up 64 ox. Non caffeinated fluid per day Apple Test o Ask yourself "would I eat an apple right now? Yes: Y
Texas A&M - KINE - 198
Lifestyle Choices and Hyperkinetic Conditions Physical Fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity. The relationship between the soundness of the body and
Texas A&M - KINE - 198
There are 25 infections that are primarily spread through sexual activity 65 million people currently living in the United States with an incurable STI 15 million people become infected with one or more STI each year. How are they