The Tacoma Narrows Bridge, built across Puget Sound in Washington, formed a standing wave before it collapsed on November 7, 1940. As seen in the photo in Fig.

(a) How many full wavelengths were between the two towers, which were spaced 2800 ft apart?
(b) If the frequency of the vibrations was 0.20 Hz, find the wave speed for this mechanical wave.
(c) Find the wavelength of the bridge€™s standing wave if the frequency isdoubled.