EXPLANATION
First we need to find the direct variation function:
[tex]w=k\cdot\nu[/tex]Then we need to use the given information λ=60 v=15 and write the equation:
[tex]60=k\cdot15[/tex]Dividing both sides by 15:
[tex]\frac{60}{15}=k[/tex]Simplifying:
[tex]4=k[/tex]So, the function is:
[tex]w=4\cdot\nu[/tex]Now, we use this function to find w when v=3:
[tex]w=4\cdot3=12ft[/tex]The wavelength is 12ft
