Light & Soound

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1.
Vibration
2.
Amplitude
3.
Pitch
4.
Echo
5.
Decibel
6.
Opaque
7.
Transparent
8.
Translucent
9.
Reflection
10.
Refraction
11.
Lens
12.
Mirror
13.
Prism
14.
Communication
15.
Sound
16.
Light
17.
Energy
18.
Wave
19.
Source
20.
Medium