Sound waves are longitudinal waves that can be characterized by their frequency, amplitude, and speed. The human ear can detect frequencies between 20-20,000 Hz, while infrasound and ultrasound have lower and higher frequencies, respectively. The speed of sound in air is approximately 340 m/s and depends on factors like temperature and pressure. Sound travels faster in solids than liquids and gases. Ultrasound, sonar, and echolocation use sound waves to form images or locate objects that can't be seen directly.

1. 10. Sound Physics: Waves, sound and light Grade 10

2. Sound waves Sound waves are longitudinal waves.

3. The frequency of a sound is an indication of how high or low the pitch of the sound is.

4. The human ear can hear frequencies from 20 to 20 000 Hz. Infrasound waves have

5. frequencies lower than 20 Hz. Ultrasound waves have frequencies higher than 20 000 Hz.