heres my part :) sorry my email and powerpoint and EVERYTHING is being gay!!!
Wavelengths are described in terms of their frequency, which are then measurd by Hertz. (Hz) The higher the frequency, the higher the pitch, because it the sound produces higher frequency sound waves. Also, the amplitude of the sound wave influences the perception of the pitch. The higher the amplitude, the louder the sound will seem to you. Amplitude is measured in decibels (dB).
Decibels are a physical measurment of sound whereas loudness is a psycholoical quality. For every 10 decibels loudness doubles. Very loud sounds can jeopardize your hearing. It can be painful, and damaging to listen to sounds above 120 decibels.
Amplitude is the main determinant of loudness, but loudness depends on the interaction between amplitude and frequency.
People are sensitive the variations in the purity of sounds, most sounds these days are mixtures of many diffrent frequencies. The purity or complexity of a sound influences how timbre is perceived. Timbre is when a note has percisly the same loudness and pitch even though it is palyed on two opposite instruments such as a violin and a french horn. The diffrence that you can hear in the two sounds is a diffrence in timbre.
Humans can hear sounds ranging from 20 Hz to 20,000 Hz. Older people are less sensitive to the high pitched sounds, becuase they are growing old. Other animals can hear things that we humans can not, for example the bat can hear noises louder than 20,000 Hz, if we were to hear that it ould be to high pitched, and it would hurt our ears.
