Last active
April 19, 2026 20:03
-
-
Save uwezi/a35421d0f0678ee9968539e8936924fc to your computer and use it in GitHub Desktop.
[Radioactive decay] Simulating radioactive decay. #manim #physics #simulate #radioactive
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| from manim import * | |
| class Atom(Dot): | |
| def __init__(self, pos=ORIGIN, color = RED, prob = 0.1): | |
| super().__init__(point=pos, radius=.07, stroke_width=0, fill_opacity=1, color=color) | |
| self.prob = prob | |
| self.add_updater(self.updater) | |
| def updater(self,mobj,dt): | |
| if (self.prob > 0) and (np.random.uniform(0,1) <= self.prob*dt): | |
| self.prob = 0 | |
| self.set_color(YELLOW) | |
| elif self.prob <= 0: | |
| self.prob -= dt | |
| if self.prob <= 0.5: | |
| self.set_color(GRAY) | |
| class becquerel(Scene): | |
| def construct(self): | |
| atoms = VGroup( | |
| Atom(pos=[np.random.uniform(-7,1),np.random.uniform(-3.5,3.5),0],prob=0.1) | |
| for _ in range(500) | |
| ) | |
| steps = 40 | |
| self.add(atoms) | |
| ax = Axes( | |
| x_range=[0,steps,10], | |
| y_range=[0,len(atoms),50], | |
| x_length=4.5, | |
| y_length=6, | |
| tips=False, | |
| ).add_coordinates().to_edge(RIGHT,buff=0) | |
| self.add(ax) | |
| lines = VGroup( | |
| Line(ax.c2p(0,len(atoms)),ax.c2p(0,len(atoms))) | |
| ) | |
| self.add(lines) | |
| self.wait(1) | |
| for t in range(1,steps): | |
| num = 0 | |
| for atom in atoms: | |
| if atom.prob > 0: | |
| num += 1 | |
| line = Line(lines[-1].get_end(),ax.c2p(t,num)) | |
| self.play(Create(line)) | |
| lines += line |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment