Report Abuse. Well I have Braces. On the first appointment they usually take a mold of your teeth. I always liked doing that. The stuff they put in the tray to mold your mouth is like playdough and smells like cup cakes.eport Abuse. Well I have Braces. On the first appointment they usually take a mold of your teeth. I always liked doing that. The stuff they put in the tray to mold your mouth is like playdough and smells like cup cakes.
Phi (/faÉª/; uppercase Ï, lowercase Ï or Ï; Ancient Greek: ÏÎµá¿ pheÃ®; Modern Greek: ÏÎ¹ fi ) is the 21st letter of the Greek alphabet. In Ancient Greek, it represented an aspirated voiceless bilabial plosive (), which was the origin of its usual romanization as ph.
From the graphic one can see that it looks like a wave, and in truth sines (and cosines) come as solutions of a number of wave equations, where the variable is a function of space and time. here phi ($\phi$) is a phase . It is a constant that tells at what value the sine function has when $t=0$ and $x=0$. If one happens to have two waves ovelapping, then the $\phi_1$-$\phi_2$ of the functions is the phase difference of the two waves. How much they differ at the beginning ($x=0$ and $t=0$), and this phase difference is evidently kept all the way through. share | cite | improve this answer.