{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ch2-2010 - Physics 228 Exam 2 8 April 2010 Profs Rabe and...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 228 - Exam 2 8 April 2010 Profs. Rabe and Coleman = Your name sticker with exam code = SIGNATURE Turn off and put away cell phones now! 1. The exam will last from 9:40pm to 11:00pm. 2. Use a #2 pencil to make entries on the answer sheet. Enter the following ID information now, before the exam starts. 3. In the section labelled NAME (Last, First, M.I.) enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial. 4. Under STUDENT # enter your 9-digit student ID. 5. Enter 228 under COURSE, and your section number (see label above) under SEC. 6. Under CODE enter the exam code given above. 7. During the exam, you may use pencils, a calculator, and one handwritten 8.5 x 11 inch sheet with formulas and notes, with- out attachments. 8. There are 16 multiple-choice questions on the exam. For each question, mark only one answer on the answer sheet. There is no deduction of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. At the ened of the exam, hand in the answer sheet and the cover page. Retain this question paper for future reference and study. 9. When you are asked to open the exam, make sure that your copy contains all 16 questions. Raise your hand if this is not the case, and a proctor will help you. Also raise your hand during the exam if you have a question. 10. Please SIGN the cover sheet under your name sticker and have your student ID ready to show to the proctor during the exam. Useful information c = speed of light = 3 . 00 × 10 8 m/s q e = - e = charge on an electron = - 1 . 602 × 10 19 Coulombs q p = + e = charge on a proton = +1 . 602 × 10 19 Coulombs m e = electron mass = 9 . 11 × 10 31 kg m e c 2 = electron rest energy = 0 . 511 MeV m p = proton mass = 1 . 67 × 10 27 kg m p c 2 = proton rest energy = 938 . 27 MeV m n c 2 = neutron rest energy = 939 . 57 MeV k B = Boltzmann’s constant = 1 . 38 × 10 23 J/K Wien’s Constant = 2 . 898 × 10 3 m · K σ = Stefan’s Constant = 5 . 670 × 10 8 W/ ( m 2 K 4 ) ¯ h = h 2 π h = 6 . 626 × 10 34 J-s h = 4 . 136 × 10 15 eV-s (in units of electron volts-second) hc = 1240 eV · nm = 1240 MeV · fm 1 nm = 10 9 m 1 ˚ A = 10 10 m = 0.1 nm 1 μ m = 10 6 m 1 mHz = 10 3 Hz 1 kHz = 10 +3 Hz 1 MHz = 10 +6 Hz 1 GHz = 10 +9 Hz 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
1. A photon, an electron, and a baseball have the same momentum. Which has the largest de Broglie wavelength? a) photon b) all have the same wavelength c) electron d) baseball and electron e) baseball 2. A particle is confined inside a cube of side length L , with one corner at the origin. The potential height of the walls of the cube is infinite. The normalized wave function of the particle, which is in the ground state, is ψ ( x,y,z ) = parenleftbigg 2 L parenrightbigg 3 / 2 sin πx sin πy sin πz, 0 <x, y, z<L What is the maximum value of the probability distribution func- tion for an electron in this state?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}