Respuesta :

Hania12

Answer:

2 times.

Explanation:

We know that f = V / λ  ................. (1)

            λ(a)=15 cm

            λ(b)=30 cm

              Va=Vb

Now by using the above formula;

      f_{a} = Va/15 = Va= 15*f_{a}

       f_{b} = Vb/30 = Vb = 30*f_{b}

         As,             Va = Vb

 15*f_{a} =  30*f_{b}

f_{a}  / f_{b} = 30/15

                                  = 2 times

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