# Analogous of theta in waves

1. Dec 31, 2013

### Jhenrique

I want you note this comparation:
$$\\ \sin(\theta)=\sin(\omega t)=\sin(2\pi f t)=\sin\left(\frac{2\pi t}{T}\right) \\ \\ \sin(?)=\sin(k x)=\sin(2\pi \bar{\nu} x)=\sin\left(\frac{2\pi x}{\lambda}\right)$$
ω is rate of change of θ with respect to t. So, exist a physic/mathematical quantity that when derived with respect to x results the quantity k?

2. Dec 31, 2013

### SteamKing

Staff Emeritus
3. Jan 1, 2014

### Jhenrique

kx is equal to which quantity?

4. Jan 1, 2014

### SteamKing

Staff Emeritus
The wave number k = 2π / λ

5. Jan 1, 2014

### Jhenrique

Wavenumber is the analogous of omega. I'm asking by analogous of theta.