What is the speed of a wave if it has a wavelength of
42 m and a frequency of 7 hertz?

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Frequency ( f ) = 7 HertzWavelength ( λ ) = 42m

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Wave velocity ( v )

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~Plug the known values and then multiply!

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Frequency ( f ) : The number of complete waves , set up in a medium in one second is called frequency of the wave. The SI unit of frequency is Hertz ( Hz ). For example : if a sound wave completes 15 compressions and 15 rarefactions in one second , it's frequency is 15 Hz.Wavelength ( λ ) : The distance between two consecutive troughs or crests in a transverse wave or the distance between two consecutive compressions or rarefactions in a longitudinal wave us called wavelength. It is the distance travelled by a wave in a time equal to it's time period. It's SI unit is metre ( m ).Wave velocity ( v ) : The velocity with which a wave propagates in a medium is called wave velocity. It's SI unit is m/s.

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Hypothesis. why don’t you know this? i learned this stuff in like 5th grade