Why does $n \lambda = 2 \pi r$ cause a standing wave in a circle?
100870
In De Broglie's Explanation for Bohr's Quantization Condition, why do we not use 2πr = n λ/2, why do we use 2πr = n λ?
60721
How does $e^{i x}$ produce rotation around the imaginary unit circle?
29389
Why does $k/m=\omega^2$ for harmonic motion?
105177
Gosper's unusual formula connecting $e$ and $\pi$
17620
Why the principal value of complex number argument is taken within $(-\pi,\pi]?$
57239
Why is energy in a wave proportional to amplitude squared?
9658
What is the length of a sine wave from $0$ to $2\pi$?
64638
What is the physical significance of curl $\nabla\times\boldsymbol{V}$?
9678
What is the equation of a general circle in 3-D space?
65300
Why is $\pi$ irrational?
149319
Möbius transformations and concentric circles
52857
Behaviour of $\frac{x^{3} y}{x^{6} + y^{2}}$ around origin
152890
What amplification can I apply to $y=\sin x$ for it to be a perfect oscillating arc?
127329
A problem about wave equation
139557
Why are the eigenvectors of the Laplacian of a ring graph sinusoidal?
148576
Origin of rapidly converging sequence for $e^\pi$
92307
Relation between shm and circular motion