ÀúÈñ µþÀÌ ³»ÀÏ ¼÷Á¦ Çѹ®Á¦¸¦ ¸øÇ®°íÀִµ¥ ÀÌÇѹ®Á¦Á» Ç®¾îÁÖ¼¼¿ä
uranium 234 has a half life of 2.7x10^5 years.
a)find the amount remaining from a 10 mg sample after a thousand years
b)how long will it take this sample to decompose until its mass is 7 mg