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Friday, December 23, 2011

johns thesis

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The aim of this experiment is to find out the wavelength l of the Helium-neon


(He-Ne) laser using double slits and different gratings.


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


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Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


Method There¡¯re two methods be used to find the wavelength with a diffraction grating and with a double slits. The diffraction grading is a series of slits or lines on a plastic or glass sheet used to produce a spectrum. The double slit has two slits, the narrow slit and the wide slit. The double slit is used to let the Helium-neon laser go though it. For both methods have following parameters


¡¤ The distance ¡°x¡±, between two laser points (the distance between n and n1) on the wall.


¡¤ In order to get a greater accuracy distance, it is suggested to take the twice distance, x, (which between points n and n) and then take the average to get n.


¡¤ Vary the slit separation, d, for both methods.


Slit to wall distance L.


Available formulae


dsin¦È=L¦Ë ¦Ë=(dsin¦È)/L x/L=tan¦È ¦È=tan-1 (x/L)


Diagrams


¡¤ Helium-neon laser





¦È





L





n x n1





Diffraction grading


Narrow slit


W Wide slit


Collected data


L=.87m L=.87m L=6.m L=4.47m


d=0.0005m x=0.0017m x=0.008m


d=0.000m x=0.001m x=0.001m


D=1/100000m x=0.5m x=0.46


D=/100000m x=1.0m x=1.47


D=6/100000m x=.4m x=.18


Data with uncertainty values


L=.85+0.05m L=.80+0.05m L=6.0=0.05m L=4.45=0.05m


d=0.0005m x=0.0017+0.0001m x=0.008+0.0001m


d=0.000m x=0.001+0.0001m x=0.001+0.0001m


d=1/100000m x=0.5+0.01m x=0.46+0.01m


d=/100000m x=1.0+0.01m x=1.47+0.01m


d=6/100000m x=.4+0.01m x=.18+0.01m





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