Answer:
5 Hz
Explanation:
The time period is given by
T = 0.2 s
The time period of the humming bird wing is given by the time taken by the wing to complete one vibration.
The frequency of the wing is given by the number of vibrations completed by the wing of the bird in one second.
The relation between te time period and the frequency is given by
[tex]T = \frac{1}{f}[/tex]
[tex]f = \frac{1}{T}[/tex]
[tex]f = \frac{1}{02}= 5 Hz[/tex]
