Iodine-131 is a radioactive form of iodine. after the crisis at a japanese nuclear power plant in march 2011, elevated levels of this substance were detected thousands of miles away from japan. iodine-131 has a half-life of 8 days. what is the daily decay factor for this substance?

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Is 9 correct? and can someone me with 10? it’s due tomorrow, you