Optional Practical: Helium Spectrum (copy)

IB Physics: Optional Practical: Helium Spectrum (copy)

In this practical you are going to view the line spectrum from a low pressure helium source through a pair of spectral glasses.The spectrum glasses are actually covered in very fine slits, such an arrangement is called a “diffraction grating”. The spectrum is formed because different wavelengths of light are diffracted by different amounts according to the equation dsinϑ=nλ. where d is the separation of the slits...

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