Hw24-2 Phy303L

Topics: Electric charge, Trigraph, Electron Pages: 4 (1164 words) Published: April 15, 2012
bui (dnb562) – HW 24-2 – Antoniewicz – (57050) This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – ﬁnd all choices before answering. 001 10.0 points A proton is brieﬂy accelerated in the −y direction, as shown in the ﬁgure below. A × B × C × k= a + D ×

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003 10.0 points An electric ﬁeld acts on an electron, resulting in an acceleration of 1.6 × 1017 m/s2 for a short time. What is the magnitude of the radiative electric ﬁeld observed at a location a distance of 5 cm away along a perpendicular to the direction of the acceleration? Use the following constants: c = 3 × 108 e = 1.6 × 10−19 1 = 9 × 109 N · m2 /C2 . 4π 0

Answer in units of N/C 004 10.0 points

At which location(s) A—D will electromagnetic radiation be detected a short time later? List all that apply, separated by commas. If none apply, enter “none”. 002 10.0 points A proton is accelerated in the direction shown by the arrow labeled a in the ﬁgure below. III II I

IV VI V a Which of the arrows labeled I-VI shows the direction of the vector a⊥ at the observation location indicated by the vector r? r 1. VI 2. III 3. I 4. IV 5. V 6. II

At the time t=0, an electron at the origin is brieﬂy accelerated in the direction in the diagram. You place a detector sensitive to electromagnetic radiation at location P, which is 9 cm from the origin. a h g f e In which direction is the electric ﬁeld in the radiation reaching your detector? Note that d b c

bui (dnb562) – HW 24-2 – Antoniewicz – (57050) directions a, c, e, and g indicate exactly on the axes while directions b, d, , and h indicate anywhere in their respective quadrants between the axes. 1. Direction f 2. Direction c 3. Direction g 4. Direction e 5. Direction a 6. Direction b 7. Direction h 8. Direction d 005 (part 1 of 6) 4.0 points An electron is initially at rest. At time t1 = 0, it is accelerated upward with an acceleration of 1.7 × 1018 m/s2 for a very short time (this large...