HOW TO USE THIS SPECTROSCOPE:
Find a florescent light source and block all other light coming into the
room by pulling curtains or shades down. Point the slit end of the
spectroscope at the light source and observe this through the view
finder. You should see what looks like a rainbow inside the
spectroscope. There may be two or three different rainbows. Look
to the right hand side inside the spectroscope and notice the scale.
While looking at the scale, tilt the slit end of the spectroscope slowly
upwards and downwards until a bright green and violet line appear
just underneath the scale. This is the appropriate view position for
this spectroscope. The scale is marked 4-7 to denote the visible
spectrum. The measure is in 100 nanometers (nm). Therefore a
bright line appearing at 4 would correspond to a wavelength of 400
nanometers.
When observing the scale, the bright purple line should coincide with
436 nm and the green line should coincide with 546 nm. If your scale
is shifted to the right or left by 10 nanometers or so, you must adjust
all your readings accordingly while using this spectroscope.
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© EISCO SCIENTIFIC ● www.eiscosci.com
EXPERIMENT: OBSERVING BRIGHT LINE SPECTRUM
Note to Teachers: There are several different spectrum tubes
available such as oxygen, neon, helium, nitrogen, argon, carbon
dioxide, hydrogen, iodine vapor, sulphur, xenon and krypton. If
you do not have spectrum tubes and a power source available
students can observe spectrum by lighting aqueous solutions of
copper sulfate or potassium permanganate.
SUPPLIES NEEDED:
A spectroscope per student/group
A spectrum tube holder
A darkened classroom
Several Spectrum Tubes of different elements/compounds
Colored pencils or markers
A chart showing the accepted spectrum for each of the
elements/compounds used
Sodium is a common contaminant in spectrum tubes. Students
may observe the sodium lines when they should not be there in the
spectrum for a given element.
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© EISCO SCIENTIFIC ● www.eiscosci.com
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