1. Reflection of sound waves. If a source of sound is directed at a vertical surface some distance away, an ECHO may be heard. Sound waves bounce off the vertical surface, and are REFLECTED back towards the source. Reflection of sound waves obey the laws of reflection. The human ear cannot distinguish between two sound bursts if they are less than about 0.1 s apart. For that reason, in order to hear an echo, the reflecting object must be more than 17 m away from the hearer (assuming sound travels at 340 m·s-1).
http://www.physchem.co.za/OB11-wav/sound2.htm
Since sound is a wave, we can relate the properties of sound to the properties of a wave. The basic properties of sound are: pitch, loudness and tone. Pitch. The frequency of a sound wave is what your ear understands as pitch. A higher frequency sound has a higher pitch, and a lower frequency sound has a lower pitch. In Figure 1 sound A has a higher pitch than sound B. For instance, the chirp of a bird would have a high pitch, but the roar of a lion would have a low pitch.
http://www.everythingmaths.co.za/science/grade-10/10-sound/10-sound-03.cnxmlplus
The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. In Figure 1 sound C is louder than sound B. The vibration of a source sets the amplitude of a wave.
http://www.everythingmaths.co.za/science/grade-10/10-sound/10-sound-03.cnxmlplus
The wavelength is the distance from the crest of one wave to the  crest of the next.    2.Frequency is the number of waves that pass a point in each  second.  …  3.Amplitude is a measure of the amount of energy in a sound wave.
http://www.answers.com/Q/What_are_three_properties_of_sound_waves
If the gas is lighter than air, the sound waves are refacted away from the normal. A balloon filled, for example, with hydrogen, will act as a diverging lens. 3. When a sound wave impacts on an object, part of the energy of the wave is transferred to the particles making up the object.
http://www.physchem.co.za/OB11-wav/sound2.htm
In the case of sound waves, the atmospheric pressure will return to the ambient pressure without an energy source to disturb it, and any vibrating surface will constitute an energy or excitation source.
http://www.indiana.edu/%7Eemusic/acoustics/waves.htm
4. What are the characteristics of sound waves? Some sound waves are periodic, in that the change from equilibrium (average atmospheric pressure) to maximum compression to maximum rarefaction back to equilibrium is repetitive. The 'round trip' back to the starting point just described is called a cycle.
http://www.indiana.edu/%7Eemusic/acoustics/waves.htm
Sound waves are different than light waves. Properties of sound waves are 1. It is a longitudinal wave 2. It requires Material medium for propogation of energy. 3. Speed of so…und depends on the medium and temperature 4. Sound waves best travel in sound 5. Their speed varies from 330 m/s in air at 0 degree centigrade.
http://www.answers.com/Q/What_are_three_properties_of_sound_waves
Frequency, Amplitude, Wave shape and Phase*. Some sound waves are periodic, in that the change from equilibrium (average atmospheric pressure) to maximum compression to maximum rarefaction back to equilibrium is repetitive. The 'round trip' back to the starting point just described is called a cycle.
http://www.indiana.edu/%7Eemusic/acoustics/waves.htm
Since sound is a wave, we can relate the properties of sound to the properties of a wave. The basic properties of sound are: pitch, loudness and tone. Figure 1: Pitch and loudness of sound. Sound B has a lower pitch (lower frequency) than Sound A and is softer (smaller amplitude) than Sound C.
http://www.everythingmaths.co.za/science/grade-10/10-sound/10-sound-03.cnxmlplus
what are the three properties of sound waves?
The three properties of sound waves are pitch, loudness, and tone.