SAT2考试时间为一小时，大部分为选择题，主要考察学生某一专业的知识，每科满分为800分，学生可以根据所申请的各专业和学校的要求参加。下面提供SAT2物理考试常用术语汇总的O和P部分。

　　O

　　Optics

　　The study of the properties of visible light, i.e., the portion of the electromagnetic spectrum with wavelengths between 360 and 780 nm (1 nm = m/s).

　　Orbit

　　When an object is held in circular motion about a massive body, like a planet or a sun, due to the force of gravity, that object is said to be in orbit. Objects in orbit are in perpetual free fall, and so are therore weightless.

　　Oscillation

　　A back-and-forth movement about an equilibrium position. Springs, pendulums, and other oscillators experience harmonic motion.

　　P

　　Pascals

　　The unit for measuring pressure. One Pascal is equal to one Newton per meter squared, 1 Pa = 1 N/m2.

　　Pendulum

　　A pendulum consists of a bob connected to a rod or rope. At small angles, a pendulum’s motion approximates simple harmonic motion as it swings back and forth without friction.

　　Period

　　The time it takes a system to pass through one cycle of its repetitive motion. The period, T, is the inverse of the motion’s frequency, f = 1/T.

　　Phase

　　Two oscillators that have the same frequency and amplitude, but reach their maximum displacements at different times, are said to have different phases. Similarly, two waves are in phase if their crests and troughs line up exactly, and they are out of phase if the crests of one wave line up with the troughs of the other.

　　Phase change

　　When a solid, liquid, or gas changes into another phase of matter.

　　Photoelectric fect

　　When electromagnetic radiation shines upon a metal, the surface of the metal releases energized electrons. The way in which these electrons are released contradicts classical theories of electromagnetic radiation and supports the quantum view according to which electromagnetic waves are treated as particles.

　　Photoelectron

　　The name of an electron released from the surface of a metal due to the photoelectric fect.

　　Photon

　　A small particle-like bundle of electromagnetic radiation.

　　Pitch

　　Another word for the frequency of a sound wave.

　　Planck’s constant

　　A constant, J · s, which is usul in quantum physics. A second constant associated with Planck’s constant is .

　　Polarization

　　A process that aligns a wave of light to oscillate in one dimension rather than two.

　　Potential energy

　　Energy associated with an object’s position in space, or configuration in relation to other objects. This is a latent form of energy, where the amount of potential energy rlects the amount of energy that potentially could be released as kinetic energy or energy of some other form.

　　Power

　　Dined as the rate at which work is done, or the rate at which energy is transformed. P is measured in joules per second (J/s), or watts (W).

　　Pressure

　　A measure of force per unit area. Pressure is measured in N/m2 or Pa.

　　Principal axis

　　The straight line that runs through the focal point and the vertex of a mirror or lens.

　　Proton

　　A positively charged particle that, along with the neutron, occupies the nucleus of the atom.

　　Pulley

　　A pulley is a simple machine that consists of a rope that slides around a disk or block.

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