Sound & LightKDP

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1.
sound
2.
light
3.
wave
4.
reflection
5.
refraction
6.
vibration
7.
energy
8.
frequency
9.
amplitude
10.
pitch
11.
volume
12.
lens
13.
mirror
14.
spectrum
15.
color
16.
travel
17.
medium
18.
science
19.
electromagnetic
20.
visible