Q1. A diffraction grating with 395 lines/mm is 1.00 m in front of a screen. What is the wavelength of light whose first-order maxima will be 16.9 cm from the central maximum on the screen?
Q2. A block with mass 0.50 {rm kg} is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 {rm m}
Q3. A small sphere of mass m = 7.30 g and charge q1 = 27.7 nC is attached to the end of a string and hangs vertically as in the figure. A second charge of equal mass and charge q2 = -58.0 nC is located at the first charge a distance d = 2.00 cm below the first charge. Find the tension of the string.