Quantum mechanics, 12, 216, 248, 250
Quark, 251, 308
Radian, 17
radian, 285
Radio waves, 177
Radiometry, 211
Radius of curvature
mirror, 189
Ragchewing, 179
Rainbow, 224, 234
angle, 237
primary, 234
secondary, 234
Rarefaction, 57
Raspberry Pi, 131
Rayleigh criterion, 218
Rayleigh wave, 65
RC circuit, 126
Real image, 191, 196
Rectangular rule, 32
Redshift, 78
Reflected wave, 59
Reflection
angle of, 188
coefficient of, 59
Refraction, 194
law of, 194
Relativity, 12
general, 12
special, 12
Remanence, 157
Resistance, 104
Resistivity, 104, 105
temperature coefficient of, 104, 105
Resistor, 104
Resonance, 49
Retina, 202
Return stroke, 97
Richter scale, 65
Right-hand rule, 139, 140, 142, 288
Robotics, 133
Rods, 202, 228
Rollin film, 248
S wave, 65
Saturn, 280
Scattering, 227
Scattering angle, 237
Schematic diagram, 111
Second (of time), 16
Second sound, 250
Secondary colors, 229
Seismic waves, 65
Selective absorbtion, 226
Selectivity, 184
Sellmeier dispersion formula, 224
Semiconductor, 92
Series
batteries, 101
capacitors, 123
inductors, 165
resistors, 106
springs, 44
Sharp, 82
Shortwave radio, 178
SI units, 15
Siemens, 107
Simple harmonic motion, 39, 141, 169
kinetic energy, 41
potential energy, 41
total energy, 41
Single-slit diffraction, 218
Slug, 19
Snell’s law, 194
Solar wind, 149
Solenoid, 140, 164
Solid angle, 285
Solid-state physics, 12
Sound, 71
audible, 74
infrasonic, 74
loudness, 79
speed, 71
ultrasonic, 74
Sound level, 79
Space physics, 149
SparkFun, 132
Spectral power distribution, 299
Spectrum, 230
Spherical aberration, 189, 196, 200
Spring
vertical, 43
Spring constant, 39, 43, 44
Spyglass, 207
Staff, 84
Standard Model, 251
Standing waves, 66
Statistical mechanics, 12