Awave has a wavelength of 8 mm and a frequency of 4 hertz. what is its speed?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

What is the major limitation to the light microscope?

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