Lab Questions 1-4 Please. Lab Name: Wavelength of light- detracting grating spectrometer

PROCEDURE (1) Use the number of lines per millimeter to calculate the grating spacing d in A and record this result on your data sheet. Check the number of significant figures (one millimeter equals to 107 A). (2) Use the telescope to view the central image of the slit, or the zeroth order diffracted light, and use this to focus the telescope such that you obtain a sharp image, and you have removed any parallax between the cross hair of the telescope and the slit image. Record this central angular position. (3) Continue to rotate the telescope to the right until you see the first-order, and then the second-order spectral images (diffracted light that interferes constructively). Record the angular positions of the observed spectral lines on your data sheet. Repeat for the left side of the central image. Be as precise as possible in reading and recording the angular positions of the telescope. As a matter of interest, check to see if you can observe any third order spectral lines. (4) Use your knowledge of the position of the telescope while viewing the central (zeroth order) image position to calculate an average angular displacement for the four major spectral lines of each source in both first and second order diffraction spectra, and use the above formula to calculate the corresponding wavelengths. Compare with given wavelengths for spectral source lines and calculate % errors. (5) Carry out steps 2-4 for both the mercury (Hg) and the hydrogen (H2) sources. ourco fin used to establish on the Questions cor of these at equal you for ver mos Which color of light, yellow or violet, experiences the largest diffraction? (2) Suppose a diffraction grating with more lines per inch was used to replace the original grating in this experiment. Attempt to explain how, if at all, this would alter the observed diffraction pattern. (3) As you look through the diffraction grating toward the light while holding it in the usual way, rotate it about a vertical axis; explain the change you see. (4) Some microwaves (EM radiation) have wavelengths of 3 cm. What would be the order of magnitude of grating spacing needed to observe these? students in your