Question

a dog produces 30khz in air taking the speed of sound in air to be 330m s_1 find its wavelenght

Answer 1

wave length= f×v
= 30×330
= 9900m

Answer 2

GIVEN,
            ν (nu) = FREQUENCY = 30 khz = 30000 hz
            v        =  SPEED           = 330 m/ s
            λ       =   WAVELENGTH = ?
               
              SPEED =  WAVELENGTH × FREQUENCY
                     330 =   λ × 30000
                     $\frac{330}{30000}$ = λ 
                             = 0.011 m