题目

1.I am chasing my future husband at a speed of 6.7 kilometers/pocoday,and the Zachary Quinto is currently 24 miles away (5280ft=1 mile,2.54cm= 1inch),how long before I catch him?
2.The half-life of carbon-14 is 5730 years.After 45840 years,a sample of 200 grams will have decayed to how many grams?
3.The half-life of germanium-66 is 30.2 years.I originally had a sample of 5 grams.How many years have elapsed if my sample has decayed to 312.5 milligrams?
4.When an atom gains or loses neutrons,the atom becomes a _______________.
5.When an atom gains or loses protons,the atom becomes a _______________element.
6.When an atom gains or loses electrons,the atom becomes a _______________.

提问时间：2020-08-05

答案

我追逐公里/ pocoday我未来的丈夫在速度6.7,而451昆托目前距离24海里（五二八○英尺= 1英里,2.54厘米= 1inch）,多久之前,我抓住他吗?2.半衰期的碳-14五千七百三年.经过四万五千八百四十零年,1克样品200将有腐烂多少...