quick one regarding period/wavelength

Hi I have done the following calculation for

1)For a sound wave that has a wavelength of 5 metres, what is the frequency of the sound? (Use 340m/sec as the speed of sound

and

2) For a frequency of 20Hz, what is the period ( T ) of the wave in seconds or milliseconds, **and** what is the wavelength in metres?

I have ....

1C) i.

If **(V = W * F)** then **(F= V/W)**

So...

**(F=V/W)** > plugin values for wavelength and velocity > **(F = 340/5)**

__F = 68Hz__

1C)ii.

**Period (t) = (1/frequency) **So... **t = (1/20)**

**t = 0.05 seconds**

**Wavelength = (V/f) V= speed of sound (340 m/s)**

**Wavelenght = (340 * 20)**

**Wavelength = 6800**

Am I correct??