Fundamental frequency!! 1. Ultrasound with a frequency of 4.079 MHz can be used to produce images of the human body.If the speed of sound in the body is the same (1.97 km/s) as in salt water, what is the wavelength in the body? Answer in units of m. and 2. On a day when the wind is blowing 49.5 km/h from east to west, a fire engine moves toward you from the west at 112 km/h and you are heading toward the fire engine at 94.6 km/h. If the fire engine has a 587 Hz siren and the speed of sound is 340 m/s, what frequency do you hear? Answer in units of Hz. i converted them to m/s. (340-12-30.2777)*1170/(340-12-30.27777) but i think i did it wrong. idk. grr and i DO NOT know how to do number 1 plz help!!