Answer :
here's the solution,
we know that,
=》
[tex]wave \: speed = wavelength \times frequency[/tex]
so,
=》
[tex]18 = 3 \times f[/tex]
=》
[tex]f = \dfrac{18}{3} [/tex]
=》
[tex]f = 6[/tex]
frequency = 6 hertz
here's the solution,
we know that,
=》
[tex]wave \: speed = wavelength \times frequency[/tex]
so,
=》
[tex]18 = 3 \times f[/tex]
=》
[tex]f = \dfrac{18}{3} [/tex]
=》
[tex]f = 6[/tex]
frequency = 6 hertz