A bat flies toward a wall, emitting a steady sound of frequency 2.00 kHz. This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly in order to hear a beat frequency of 10.0 Hz? Give your answer to two significant figures. Take the speed of sound to be 344 m/s. i know it's like a doppler + beat frequency problem and the equation to use is basically v=freq*wavelength and substitude lots of stuff in. but i get confused... someone help plz. thanks.