What's the cheapest way to detect vibration with Arduino?
What's the vibration sensor that I need?
I want to detect PING PONG NET vibration and light on led if touched.
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Piezo sensors are cheap, reliable and designed for the purpose you suggest - arduino tutorial
In the uk, bitsbox has one for 75p. You can probably find others cheaper, or salvage from electronic toys.
EDIT following poster's clarification of use: Sound is vibration through the air, I see no reason why a piezo sensor cannot accomplish what you suggest, but the form factor may not be ideal for fixing to ping pong nets! I think a flex sensor would be more suitable, sewn into the top of the net.
You may be interested in how to create a simple circuit using a piezo element and Arduino Uno that can detect vibration with high sensitivity http://davidhoulding.blogspot.com/2014/11/advanced-high-sensitivity-vibration.html Have fun.