1. As with any tool in the lab, you need to calibrate the instrument using a known reference. For a spectrometer you can use a laser, with a known wavelength as a light source. So for instance if you used a laser with  = 532 nm and you find that the first order maximum for the diffraction grating being used in your spectrometer is observed at  = 25°, what is the spacing, d, between the slits for this diffraction grating? How many slits are there per mm?

Urgent pls a. coal consumption levels off and remains flat. b. petroleum, natural gas, and renewables show an increase in consumption c. more nonrenewable resources continued to be consumed than renewable. d. there is little projected increase in nuclear energy use. e. carbon dioxide emissions are projected to decline as we approach 2040. global energy consumption is defined as the total energy used by an individual or organizations from around the world. use the graph above to analyze the projected energy consumption from now until 2040. which statements in the prompt apply? a) a, b, d b) b, c, d c) a, c, d d) a, b, c, d

You can decrease the resistance of a length of wire by

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?