Sci STD 8 ch 13 sound solution

Sci STD 8 ch 13 sound solution

                                              sound is a wave..... FROM THIS chapter student can know what the sound is....... he or she can know the define  of sound..... they can know the difference among different sounds....................... they can know about the word wave....... what the wave is and how it works............................... they can see the different instruments of music and can know about it.......

difference between audio voice and non audio voice........
if the frequency of voice is between 20 hertz and 20000 hearts then it is called audio voice
if the frequency is below 20 hearts it is called ultrasonic waves
if the frequency is above 20000 hearts it is called supersonic waves...........

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