(Answered) 1 light emitted by element x passes through a diffraction

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1. Light emitted by Element X passes through a diffraction grating having 1200 lines/mm. The diffraction pattern is observed on a screen 75.0 cm behind the grating. Bright fringes are seen on the screen at distances of 56.2 cm, 65.9 cm and 93.5 cm from the central maximum. No other fringes are seen.

a) What is the value of "m" for each of these diffracted wavelengths? Explain why only one value is possible?

b)What are the wavelengths of light emitted by Element X?

3. A Michelson Interferometer uses light from a sodium lamp. Sodium atom emits light hour wavelengths 589.0 nm and 589.6 nm. Interferometer is initially set up with both arms of equal length (L_1 = L_2) producing a bright spot at the center of interference pattern. How far must mirror M_2 be moved so that one wavelength has produced one more new maxima then the other wavelength.

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