The half life of uranium-235 is 4.5 billion years. If 0.5 half-lives have elapsed, how many years have gone by?

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

What are some properties of transverse waves?