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Unformatted text preview: Lab 11 Interference and Diffraction Lab 11 Report (100 points) Name: 
PHYS 1214 2114/ Section: 3 Z Day and Time: N h T20 /t
Station Checkin: if“ Part 1: Single Slit Interference Patterns (20 pts) R = I‘HO (m), not meters or cm! Single Slit A
Slit Width a = 0‘ OZ (mm) Single Slit B
Slit Width a = 0  04 (mm) Single Slit C
Slit Width 21 = C) 0‘5 (mm) 153 Lab 11 Interference and Diffraction Part 2. Double Slit Interference Patterns (28 pts) A. Same Slit Widths, but Different Slit Spacing Double Slit A
Slit Width a = O r 0 4 (mm) Slit Spacing d = J”). 2 5 Q (m) Double Slit B
Slit Width a = 0x 0 4 (mm) B. Same Slit Spacing, but Different Slit Widths Double Slit A Slit Width a = C5 ‘04 (mm) Slit Spacing d = 0 IZSO (mm) Double Slit C I A
Slit Width a= 0 ‘1 (mm) Part 1: Single Slit Interference Patterns (20 pts) 154 Lab 11 Interference arﬂiffraction 1. What do Equations 1 and 2 predict will happen to the singleslit difﬁactiopﬂ (intensity, fringe width,‘and fringe spacing) as the slit width is increased. / (10 pt
( t ' 1 "'i . f
Igtcocairxs +0 ‘ {gala—agar; 1 and 2’. I we ext/mpg 33” d"¥f\,acﬁ¢n ?0\+ievﬂ of \ La"? C VivH"??? 053 ‘3“, to‘: (6")? i": {711: {warrant N“... _, What did you observe happen to the singleslit diffraction pattern as the slit width was
increased. Refer to the singleslit diffraction patterns that you observed in Part 1. Tm St'ﬂgte—slii' iii?;(’f”’."";0n portend. mantel, dccmmac as. “pa v .1.’ .N ‘v l l‘ , < . v‘ _ ,
3"" NW A": !I\C\ C0505": . new; 1'. coats: 560 ‘1‘.“ 1A.)!"‘\*~ “we: (Iota,1: an 0?” 't‘r'c (‘14! ‘1’" 3 5's: I. 2. From the singleslit patterns (Single Slit A), the slit widths, and the distance to the screen
recorded in Part 1, determine the wavelength 9» of the incident red laser light. Show all
work and thoroughly explain your reasoning. (Hint: To determine 9» refer to Equation 1
and Figures 911. Use a ruler to measure the distance between the center of the pattern to
the center of an appropriate fringe.) (10 pts) 19W) 8: MA w
2% NSlAS _ gamma _4 pm. — i 11‘ X10 mm
: 1 (0.0c‘m\‘__ o
8 tan {—w’qé‘cmr 1.77 Part 2: Double Slit Interference Patterns (32 pts) 3. What does Equation 6 predict will happen to the doubleslit diffraction pattern (intensity,
fringe width, and fringe spacing) as the distance between the slits is increased while
holding the slit width constant? (10 pts) Accow‘mﬁ, to €Q\»I“;‘”"0ﬂ (L TN; dmbwﬁ'ﬁr dw’é‘a L»;‘‘.“‘.L.7«‘= «cl'¥~("\”.‘ i" K:$?f.‘\‘"‘t" 1.  ‘  ' "
P L ‘ ‘ * ‘9’ ~ mm CarC631 Ma (1 hold‘. cw TM ‘31" (ers What did you observe happen to the doubleslit diffraction pattern as the distance
between the slits was increased while holding the slit width constant? Refer to the
doubleslit diffraction patterns that you observed in Part 2A. The — ‘  ,.
doub\c 5M4? \ff'm C’i‘l CA‘) in lr‘t (‘ x r ix) mJ lfi (,i CC 1' (:0 EC a 5 4.01:, 5114 52941“, “Ml5C1“? '3 «‘~ =3‘ "3 halal '. not, ﬁt  :3‘ ‘ 4’ (":1 “l ‘ ' y :“ v »L 155 Lab 11 Interference and Diffraction 4. What does Equation 8 predict will happen to the doubleslit diffraction pattern (intensity, 5. fringe width, and fringe spacing) as the slit width is increased while holding the distance
between the slits constant? (10 pts) ‘ " ; Accm‘ﬂmc; *0 equor'r'm": w dwb‘c~— gm d.{%.ch'm\ Pakqu l‘dll‘l: dec‘,m_ﬁc 2m 0‘5 +02 SEE“? wl‘d+r\ i'ncrecxseol while voiding +¥xe drs‘fa‘ﬂCe beﬁueen 'f'he gift3 (Savvyany What did you observe happen to the doubleslit diffraction pattern as the slit width is
increased while holding the distance between the slits constant? Refer to the doubleslit
diffraction patterns that you observed in Part 2B. The double —s[ l‘r d ué‘éllnch‘m‘: 5361+} rr r* 5me rd dec‘ re Ot‘ﬁﬁ r n q H
5 “+99 0 V; ow: +496 5! {4— w {drum inc: me Q $9 0}: w h Me
.? J’hE‘ W t“. We mitt"; COVVQd'Q v: From the doubleslit patterns (Double Slit A), the distance between the slits, and the
distance to the screen recorded in Part 1, determine the wavelength X of the incident red
laser light. Show all work and thoroughly explain your reasoning. (Hint: To determine
X refer to Equation 6 and Figures 1315. Use a ruler to measure the distance between the
center of the pattern to the center of an appropriate fringe.) (10 pts) 5H we: » 2
"ii. . i ~ 03¢ 4
I ’ ‘ — Z ) ‘ } j C . I". 3‘: lC} ‘r\\ﬂ~\‘\
rv ', (a
‘r/ I 1— g G; O
a I (M ,, or 8 6. Calculate the percent difference between the two calculated wavelengths. (2 pts) (p.44 M043 (OAS Mo“ W___ ‘ X500 1‘ (4 ,_ ﬁn
! . 4.»: °/(,
C,l4.1\ .Yle 156 ...
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This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.
 Spring '08
 Bandy
 Diffraction

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