Light of wavelength 500 nm falls normally on 50 slits that are 3.9 ✕ 10−3 mm wide and spaced 3.51 ✕ 10−2 mm apart. How many constructive interference fringes lie in the central peak of the diffraction pattern? (Round your answer to the nearest integer.)

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

How can waves travel through ground?