a radioactive element with two isotopes has been discovered on a planet with different physical laws than earth's. the isotope undergoes fission when bombarded with neutrons. however, one isotope of is far more abundant than the other. to separate it from , is first converted to , which is easily vaporized above room temperature. the mixture of and is then subjected to many stages of effusion. calculate how much more quickly effuses than . give the answer as the ratio of rates of to to four decimal places.