If matter is radioactive, does it glow green? When you watch TV, you'll see what I mean. Not until mixed with Cu and ZnS, will radium glow. That enlightening fact will lead you where to go. You can't see gamma, x-rays, or UV, But if you look at a wavelength of live hundred thirty (nm), You will surely see me. ​

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