1.1. A foghorn makes a loud, low-pitched warning sound when a ship is moving in fog.

State the relationship between the frequency of a sound wave and the pitch of the sound.

1.2. The foghorn emits sound waves with a frequency of 160 Hz.

The speed of sound is 340 m/s.

 (i) State the equation linking wave speed, frequency and wavelength.

(1)

(ii) Calculate the wavelength of these sound waves.

(2)

 wavelength = ...................... m