1) The figure shows an interference pattern from two slits. If the slits are 0.1
ID: 1324949 • Letter: 1
Question
1) The figure shows an interference pattern from two slits. If the slits are 0.17 mm apart and the observed picture is seen on a screen 4.66 m from the slits, find the wavelength of the light used. Since different computers will render the figure to be different sizes, note that when rendered full-size, the image is 8.225 cm tall and 5.08 cm wide. To obtain an accurate value for the distance between fringes, measure the distance between the topmost and bottommost fringes and divide by 4.
2)Multiple Choice Question: You decide that you want to play with two-slit interference patterns at home with your laser pointer. You make two slits in a piece of aluminum foil with a sharp knife, and then shine the laser pointer through the slits and onto a wall 2 meters away. If the laser has a wavelength of 650 nm, and if you are able to see discern the fringes as long as they are spaced apart by at least 1 mm, how close must your slits be spaced in order for you to be able to see the interference pattern?
1.30 mm
2.60 cm
2.60 mm
0.561 mm
0.0561 mm
1.30 cm
None of the above
1) The figure shows an interference pattern from two slits. If the slits are 0.17 mm apart and the observed picture is seen on a screen 4.66 m from the slits, find the wavelength of the light used. Since different computers will render the figure to be different sizes, note that when rendered full - size, the image is 8.225 cm tall and 5.08 cm wide. To obtain an accurate value for the distance between fringes, measure the distance between the topmost and bottommost fringes and divide by 4. 2)Multiple Choice Question: You decide that you want to play with two - slit interference patterns at home with your laser pointer. You make two slits in a piece of aluminum foil with a sharp knife, and then shine the laser pointer through the slits and onto a wall 2 meters away. If the laser has a wavelength of 650 nm, and if you are able to see discern the fringes as long as they are spaced apart by at least 1 mm, how close must your slits be spaced in order for you to be able to see the interference pattern? 1.30 mm 2.60 cm 2.60 mm 0.561 mm 0.0561 mm 1.30 cm None of the aboveExplanation / Answer
Measure the distance from the center of the top and bottom fringes. I get that to be 6.3 cm
Divide by 4 and get 1.575 cm (.01575 m)
Then y/L = m(wavelength)/d
(.01575)/(4.66) = 1(wavelength)/(1.7 X 10-4)
wavelength = 575 nm
Number 2)
Apply y/L = m(wavelength)/d
(.001)/(2) = 1(650 X 10-9)/d
d = .0013 m
That is 1.3 mm (The first choice)
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