Acontaminated rag has been decaying for 48 hours and its activity measured to be 10.72% of its original activity. what it the half-life isotope?
a- 0.04652 hrsb- 48 hrsc- 24.09 hrsd- 14.9 hrs

What is the role of the ocular lens?

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.