Amonochromatic light passes through a narrow slit and forms a diffraction pattern on a screen behind the slit. as the slit width increases, the diffraction pattern:
o becomes dimmer.
o shrinks with all the fringes getting narrower.
o spreads out with all the fringes getting alternately wider and then narrower.
o remains unchanged.
o spreads out with all the fringes getting wider.

How many electrons does each element require in its valence shell to become stable?

An experiment was performed on a 2-kg block. forces of 5, 10 and 15 newtons respectively were applied to the block for 5 seconds. describe the difference in acceleration between the three trials. a) the final accelerations will all be the same. b) the final acceleration will triple between the first and third trial. c) the final acceleration will be cut by 1/3 from the first to third trial. d) the final acceleration will increase nine time between the first and third trial.

In an exothermic chemical reaction the energy gained by the surroundings must be the energy lost by the reaction