1phenomenon
2velocity
3gravity
4mass
5laboratory
6physics
7acoustics
8dynamics
9composition
10element
11atom
12density
13compress
14spectrum
15wavelength
16frequency
17infrared
18visible
19light
20convex
21lens
22concave
23refraction
24reflection
25ray
26laser
27energy
28entropy
29acceleration
30gravitation
31friction
32pendulum
33inertia
34vector
35sonic
36ultrasonic
37volt
38watt
39ampere
40magnetic
41Pole
42pole
43nuclear
44radioactivity
45microwave
46convert
47ultraviolet
48force
49motion
50transistor
51matter
52reaction
53phase
54electricity
55temperature
56technology
57particle
58molecule
59sound
60wave