SOUND - sound waves travel outward in all directions from the source. They can all be heard, but how? Students learn how sound waves travel as well as about their properties, frequency, wavelength, amplitude and pitch. With a fun hands-on activity, this program illustrates the key concepts of sound and its properties. (Library Video Company, USA)
SOUND - sound waves travel outward in all directions from the source. They can all be heard, but how? Students learn how sound waves travel as well as about their properties, frequency, wavelength, amplitude and pitch. With a fun hands-on activity, this program illustrates the key concepts of sound and its properties. (Library Video Company, USA) 
