Trong mẫu chứa 1.49 μg khí 13 7N với chu kỳ bán rã t1/2 = 600 s. Hãy xác

định : số lượng hạt nhân 13

7N trong mẫu; hoạt độ phóng xạ của mẫu; hoạt độ

phóng xạ của mẫu sau 1 giờ.

answer; /// i believe that the correct answer is (c)

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

v patient student

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

the answer to this is proletariats.

hope this : )