The period of a note is 0.3 seconds and the speed of sound in air is 340 m/s. What is the wavelength of the note? Give your answer to 3 significant figures. (3 marks) b A bird on a post out at sea is exposed to a series of water waves, each travelling at 3.3 m/s, that periodically splash its feet when the crest of the wave hits the post. Each crest is 4.5m apart. For how long do the bird's feet dry for between each drenching? (2 marks) A radio station RadioDJJazzy broadcasts on a frequency of 102 MHz. Radio waves have a speed of 3 x 10' m/s. a What is the wavelength of RadioDJJazzy? (2 marks) b What is the period of this wave? (1 mark)