Index
overtones         440

P
p (momentum)         306
p-n junction         688
paper airplane
    and work–energy theorem     288
parabola         184
parachutes         123
parallel circuit         489
parallel plate capacitor         537
paramagnetism         517
particle
    model     122
particle physics         814
pascal (Pa), unit of pressure         673
Passel, Charles—and wind chill index         711
Pauli exclusion principle         769
Pauli, Wolfgang         769
pendulum         393
    energy of     290
Penzias, Arno         16
period
    definition of     390
periodic force         401
periodic table         769
permanent magnet         510
permeability of free space μ0         563
permittivity ε         537
perpetual motion machines         276
Perrin, Jean         666
phase
    of an oscillator     396
    of sound waves     456
phases
    of the Moon     580
phases of matter         667
    changes between     667
    interactive simulation     668
phosphorescence         762
phosphorus, impurity in semiconductors         687
photoelectric effect         650
    interactive simulation     651
photogates
    in ErgoBot     195
photon         644
photoreceptors, rods and cones         623
photovoltaic cell         27
physics
    careers     24
    mechanics     5
    nature of     4
piano         459
pinhole camera         582
pipe organ, and resonance         457
piston and cylinder         737
pitch         461
    of a screw     348
    of sound     440
pixel         23
Planck, Max         649
Planck’s constant h         649
plane wave         418
planet
    definition of     215
plasma
    phase of matter     508
platinum
    density     43
plotting points         57
plum pudding model of the atom         754
plutonium         802
polarity
    magnetic poles     511
    of an electromagnet     549
    reversal in electric motor     551
polarization
    of a wave     415
    of light     644
position         70
    graphical model for     80
    one dimensional     76
    particle model for     122
position vs. time graph         80
positive
    position     70
positron emission tomography (PET)         801
post
    in structures     243
potential difference         475
potential energy
    elastic     259
    gravitational     257
pound         132
pound-foot, English unit of torque         236
power
    definition of     263
    electrical     264
    in electrical circuit     494
    in series and parallel circuits     495
    of typical electrical appliances     266
Power, Cecil         790
precession of Earth’s axis         380
precision         48
    decimal places in measurement     48
pressure         673
    absolute and gauge pressure     674
    and potential energy     678
    hydrostatic pressure     677
    oscillation in sound waves     442
principal axis
    for curved mirror     597
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