Answer:
The correct option is (b) i.e. 0.03 m.
Step-by-step explanation:
We have,
Speed of a wave is 0.09 m/s and the frequency of a wave is 3 Hz.
It is required to find the wavelength of a wave.
The speed of a wave in terms of wavelength and frequency is given by :

So, the wavelength of a wave is 0.03 m.