Thorium-234 has a half-life of roughly 24 days. If you have a 500 g sample of thorium-234, how much will be left after 48 days?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d