A thin 4.5 -m metal rod sustains a longitudinal standing wave with vibration antinodes at each end of the rod. There are no other antinodes. The density and Young's modulus of this metal are, respectively, 8800k(g)/(m^(3)) and 7.1\times 10^(10)(N)/(m^(2)). What is the frequency of the rod's vibration?
Number 항 ◻ Units ◻