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The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage