A truck moving at 36 m/s is in the process of being passed by a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz (stationary frequency), what is the frequency heard by an observer in the truck as the police car approaches the truck, just before passing

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?