Answer:
f = 33.34 Hz
Explanation:
A wave has a period of 0.03 seconds. It is required to find the frequency of a wave. The relation between time period and frequency is inverse. The time period of a wave is given by :
T = 1/f, f = frequency of wave

So, the frequency of the wave is 33.34 Hz.
It creates oxygen which every living thing needs to live. i hope this helps! :)
1.3 x 10¹⁵ : 1.2 x 10⁹ = 1.083 x 10⁶