Chu kỳ bán rã của phốt pho phóng xạ 32P là 15 ngày. Tìm hoạt độ phóng xạ của tiêu bản 32P sau 10 ngày kể từ khi chế tạo ra nó, nếu hoạt độ phóng xạ
ban đầu của tiêu bản là 100 μCi.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?