Problem 6. A sodium-vapor street lamp produces light that is nearly monochromatic. If the light shines on a wooden door in which there are two straight, parallel cracks, an interfernece pattern will form on a distant wall behind the door. The slits have a separation of 0.3740mm, and the second-order maximum occurs at an angle of 0.18046 degrees from the central maximum.(adsbygoogle = window.adsbygoogle || []).push({});

determine the angle of the fourth-order minimum. Answer in degrees.

Would it be:

d sinθ = (m+1/2)λ

(0.3740*10^-3)sinθ = (m+1/2)λ does m=3?

Problem 15. By attaching a diffraction-grating spectroscope to an astronomical telescope, one can measure the spectral lines from a start and determine the start's chemical composition. Assume the grating has 3224 slits/cm. The wavelengths of the star's light are wavelength_1=463.200nm, wavelength_2=640.500 nm, and wavelength_3=704.700 nm.

Find the angle at which the second-order spectral line for wavelength 1 occurs. Answer in deg

rees.

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