A wave is traveling at a speed of 120 m/s and its wavelength is 4 m. Calculate the wave’s frequency and period. HELP PLS

Can anybody me with this? ? (picture included.)

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.