Asmall amount of americium-241 is used in smoke detectors. a stream of radiation flows between two electrodes. if smoke interrupts the stream, the alarm goes off. what feature of the radioisotope americium-241 would be most for the smoke detector to work? long half-life short half-life over-sensitive detection less sensitive detection

Avariable that is not being directly tested during an experiment should be

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.

Which statement is true regarding the diagram of circle p? the sum of y and z must be 2x. the sum of y and z must be x. the difference of z and y must be 2x. the difference of z and y must be x