Physics - Waves - Properties - Wave equation (v = fλ) - Wave Speed Challenge

Present wave speed facts and ask prediction questions. (1) 'Sound in air vs sound in water. Which is faster?' (Water - 1500 m/s vs 340 m/s). (2) 'Light vs sound. You see lightning before hearing thunder because...' (Light is much faster). (3) 'If a wave has frequency 10 Hz and wavelength 2m, its spe