A sound wave with a wavelength of 2.5 m travels 660 m in 2s. Calculate the frequency of the wave.

Frequency of wave = 132 Hz

Explanation:

Given

Wavelength = 2.5 m

Distance = 660 m

Time = 2 s

Frequency = ?

In order to find frequency, we have to calculate velocity. We know that the velocity is given by formula:

velocity =  

              = 660 m / 2 s

             = 330 m

 Also we know that for all waves, the relationship between wavelength λ, frequency f and velocity v is same and given by the equation:  

                          v = fλ  

Hence frequency f = v/λ  

                                = 330 m / 2.5 m

                                = 132

                                = 132 Hz

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6