What is the frequency of a sound wave with a wavelength of 2 m traveling at 340 m/s?

A bungee jumper with a weight of 600 N dives off a tower. When he reaches the point where the elasticity of the bungee cord makes him spring back up, the bungee cord has increased its length by 10 m. What is the Hooke’s constant for the bungee cord?

A person hears a sound with a frequency of 100 Hertz. How often does a crest of the sound wave enter the listener’s ear?