B8 Sound

27 Feasible experiments.

• Hearing
• When do we hear a sound?
• The oscillations
• The period of oscillations
• The frequency of oscillations
• The graphic representation of the oscillations
• Why we hear sounds
• Acoustic waves
• How acoustic waves are transformed into sounds
• The ear: a receiver of acoustic waves
• The ear-brain system
• The limits of audibility
• The sensitivity of the hearing system
• How to reinforce auditory sensitivity
• The distinctive characters of the sounds
• Stereophony
• The reflection of acoustic waves
• Interference of acoustic waves
• The beats
• The sonometer
• Resonance
• Stringed musical instruments
• Musical instruments working with air
• Take care of the hearing system