The velocity of a wave or rather simply says, wave velocity can be calculated if we are given the frequency along with the wavelength.
Answer: Option 4
Explanation:
The wavelength of the wave is the distance measured between the two similar formations caused by wave in succession such as the two elevated formation known as crest or two down formation known as trough.
Frequency is the measured number of wave formation formed between two fixed point and position taken into consideration for a given specified time. Both these factor, together accounts for velocity of wave by multiplication product.