no edit summary
This Activity draws a picture of the sound heard by the internal microphone or of the signal present on the microphone socket. More specifically it draws a graph of this input versus time, the input is on the vertical axis and time is on the horizontal axis. That is, the laptop functions like a machine called an oscilloscope.
[[File:Measure tut 1 24.jpg|center|300px]]
22. Show frequency.
Let the children experiment with the internal microphone, try singing, whistling, musical instruments, the Tam Tam musical Activity. The Turtle Blocks Activity can generate an audio tone, see the Python Block.
* the more pure sounds have less harmonics
'''Sharing '''==This Activity does not support sharing.