New 300-m high citicorp tower oscillates in the wind with a period of 6.80s calculate frequency vibration?

The frequency of vibration can be calculated using the formula:

$$f = 1/T$$

Where:

- f is the frequency in Hertz (Hz)

- T is the period in seconds (s)

Substituting the given period of 6.80s into the formula, we get:

$$f = 1/6.80s = 0.147Hz$$

Therefore, the frequency of vibration of the citicorp tower is 0.147Hz.