H133_quiz1_key

H133_quiz1_key - Name KE Physics H133(Spring 2011 Quiz#1...

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Unformatted text preview: Name: KE\ Physics H133 (Spring, 2011): Quiz #1 Full credit 2 10 points In each case, half the pomts are for the correct answer and halffor a correct explanation. Possibly useful relations: 1):)1f k=g§ w=27rf dsin 9m 2 n1 asin 6nd 2 n1 f(a:, t) : AsinUmt) cos(wt) 1. (1 pt) You are walking past a construction site on campus. You ycll into the end of a pipe that has both ends open. The echo sound waves are BiA. inverted El B. not inverted “TL C1946 5263 has QSRWQM £1211 33W: 11ng ‘1)(9/{3 191111 1) \3 C003 \ 9'3) ““46?qu WA: 1;. 1 1 2. (1 pts) Suppose the pipe is 1m long. With your great singing voice and perfect pitch ‘0 you sing a musical note with a frequency of 600 Hz (1) in one end. Assuming the speed of sound is 340 m/s, do you set up a standing wave in the pipe? 13 A. yes 81 B. no . ‘ Show your work! Col“ 00 eodn {ob ’39RWJ3 \OWFQMVB wklliins wtvehnqfin ” L : Mom/s :0 Ca? «1 so “111 Q‘Q’Q \5 not no Sf 600 A”? MW :66? Neatly? 0‘5“; Mmhhgllfib 5‘0 1 S\o.f\ 11») wow dQ€3 “(33‘ $0M“ 3. (2 pt) If you answered “yes” in the last problem, what harmonic is it? If you answered “no” in (b), What is the nearest frequency to 600 Hz where you would set up a standing wave, and what harmonic would it be? Show your work! @2111 MM \mri‘n we 091m “No he NJWVM) WWW 91 m\ w. ml} 551;)? 0 651110131110) 2 is) f~\//>\ BHOmS/oem,t%blzl1 5;;ka («0A ‘ 3/, ‘45) :1 LN 'L 1.51; mm , m 1 >94- :1" l} " M1101" m /A c L job lV'WWn 1 FU‘J’V j 1%): ;1_ :7 \11 50 \3(K\10Fmow’ji?\kl\crer\d 1R 16UV1M111;:11.6l\U1m> 4. (1 pts) For either case in 3., ~2de a picture of the wave labeling the nodoswaflflfin antinodes. tam 0)? eoks J 1’th Ll axis/101119 grofimobsiu ;. 11/ 11/ h0&s 61‘ L £3,330 L”1\1.::71\~l\ 5. (3 pts) We project monochromatic light onto a screen from a distant single slit. For each change in experimental conditions below, indicate whether the width of the central bright spot increases, decreases, or remains unchanged (check one in each case). Explain your reasoning. a. (1 pt) The slit width increases: the bright spot width El increases ddecreases E remains unchanged b. (1 pt) The wavelength of the light increases: the bright spot width increases El decreases D remains unchanged c. (1 pt) The intensity of the light increases: the bright spot width [3 increases El decreases Eldon Km 06qu \MW 82 €Q55Y \s geeof’lxoool )0 ‘dfifi 5m ’0’ i ,0. at 0’) MP6 QM W a M «we as I? C @«t sacs n3? Emma 00 Ml: omfij 6. (2 pts) Waves from two slits S and Q will destructively interfere and cancel at a point P if the distance between P and S is larger than the distance between Q and S by IS/remains unchanged (mark one and explain): . ”A (where n is an integer) C ~2— ‘ V > @ (n + %)A (where n is an integer) 731 , /\ ‘ \\ . 6- 21; (min (3&3?an f. Other (specify) gaecjb/rc iVQ \¥ 2) 32" ,5: { »> a > 3 \lil Credi)’ 93? C unless also Sled-'6 The)” n )5 (:23) ...
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