doppler rador

Doppler radars are far and away the best tool for detecting rainfall around the area . 
They work by sending beams out in a circle pattern around the radar.

interferences

1. the difference between constructive and destructive interference is when the constructive interference is If the two amplitudes have opposite signs, they will subtract to form a combined wave with a lower amplitude. The destructive interference is when a Sound waves with higher amplitudes sound louder than sound waves with lower amplitudes.one of my examples is noise canceling headphones that is a destructive interference. 

standing waves

in todays lab drew the wave then we find the wavelength then we find the frequency then after that we find the speed you find the speed by multiplying the wavelength and the frequency together.
today i learned how to find the frequency and to find the speed of the wave.