two narrow slits separated by 1.5mm are illuminated by yellow light from sodium lamp that has a wavelength of 589nm. find the spacing of the bright fringes observed on a screen 3m away

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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he made 11 calls in one day

grav forces affect all objects magnetic forces affect magnetic objects and electric currents