Calculating Wavelength Using Atomic Emission Spectra and Balmer Series Equation

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To calculate the wavelength of light observed in the atomic emission spectrum from a helium lamp, one can use the diffraction grating formula, which relates the angle of diffraction to the wavelength. The Balmer series equation is specifically for hydrogen, so it may not apply directly to helium without adjustments. The principal quantum numbers for the Balmer series are typically n=2 for the first line, but for helium, the transitions would involve different energy levels. Measurements taken from the meter stick can be used to determine the angle of diffraction, which can then be plugged into the formula to find the wavelength. Understanding these principles is crucial for accurately calculating the wavelength in atomic emission experiments.
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in an experiment we looked through the diffraction grating to see the spectrum made by a helium lamp.

we measured the distance along the meter stick to the point where we saw each color.

based on that distance how would you calculate the wavelength of the light that was seen?
would you use the balmer series equation? and if so what would be the principal quantum numbers?

any help on how to figure this out would be appreciated
 
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