Sound as an example of a wave (16/5)
Sound is a longitudinal wave, perceived loudness depends on amplitude of wave
Ability to hear
- Young people 20-20 kHz
- Older people 20-14 kHz
- Dogs - 30 kHz
- Bats - 100 kHz
ultrasonic waves: f > 20 kHz
infrasonic waves: f < 20 Hz