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When hydrogen gas is excited (using electricity, for example), the hydrogen will emit light. One of the wavelengths from hydrogen is λ
λ=656 nm, which is called the hydrogen alpha line. Suppose the light from hydrogen gas is directed through a diffraction grating and the hydrogen alpha line produces a spectrum where the third maximum is θ.
θ=36 degrees away from the central maximum. You use a ruler to measure the width of the grating and find that it is w
w=2.6 cm. Calculate the number of lines in the grating.
This is a slit experiment type question. use the definitions of double slit experiments dsin(θ)=mλ/N
Question: Derive an algebraic expression for the number of lines in the grating. Type c to represent θ. Type ???? to represent λ.
N =
Hints: The bright fringes from a grating are narrower than from a two-slit experiment. The equation for maxima is the same for two slits, three slits, and many slits.
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