sat考试物理必背的高频词汇

　　sat考试的物理部分是很难的，考生如果准备了一些必背的物理高频词汇有利于sat考试拿高分。快来看看小编为你准备了sat考试物理部分必背的.一些高频词汇，欢迎大家阅读!

sat物理高频词汇

　　sat物理必背的高频词汇：L开头

　　Latent heat of fusion

　　The amount of heat necessary to transform a solid at a given temperature into a liquid of the same temperature, or the amount of heat needed to be removed from a liquid of a given temperature to transform it into a solid of the same temperature.

　　Latent heat of sublimation

　　The amount of heat necessary for a material undergoing sublimation to make a phase change from gas to solid or solid to gas, without a change in temperature.

　　Latent heat of transformation

　　The amount heat necessary to cause a substance to undergo a phase transition.

　　Latent heat of vaporization

　　The amount of heat necessary to transform a liquid at a given temperature into a gas of the same temperature, or the amount of heat needed to be taken away from a gas of a given temperature to transform it into a liquid of the same temperature.

　　Law of conservation of energy

　　Energy cannot be made or destroyed; energy can only be changed from one place to another or from one form to another.

　　Law of reflection

　　For a reflected light ray, . In other words, a ray of light reflects of a surface in the same plane as the incident ray and the normal, and at an angle to the normal that is equal to the angle between the incident ray and the normal.

　　Legs

　　The two shorter sides of a right triangle that meet at the right angle.

　　Lenz’s Law

　　States that the current induced in a circuit by a change in magnetic flux is in the direction that will oppose that change in flux. Using the right-hand rule, point your thumb in the opposite direction of the change in magnetic flux. The direction your fingers curl into a fist indicates the direction of the current.

　　Longitudinal waves

　　Waves that oscillate in the same direction as the propagation of the wave. Sound is carried by longitudinal waves, since the air molecules move back and forth in the same direction the sound travels.

　　Loudness

　　The square of the amplitude of a sound wave is called the sound’s loudness, or volume.

　　sat物理必背的高频词汇：I开头

　　Impulse

　　A vector quantity defined as the product of the force acting on a body multiplied by the time interval over which the force is exerted.

　　Incident ray

　　When dealing with reflection or refraction, the incident ray is the ray of light before it strikes the reflecting or refracting surface.

　　Inclined plane

　　A wedge or a slide. The dynamics of objects sliding down inclined planes is a popular topic on SAT II Physics.

　　Index of refraction

　　The index of refraction n = c/v of a substance characterizes the speed of light in that substance, v. It also characterizes, by way of Snell's Law, the angle at which light refracts in that substance.

　　Induced current

　　The current induced in a circuit by a change in magnetic flux.

　　Inelastic collision

　　A collision in which momentum is conserved but kinetic energy is not.

　　Inertia

　　The tendency of an object to remain at a constant velocity, or its resistance to being accelerated. Newton’s First Law is alternatively called the Law of Inertia because it describes this tendency.

　　Inertial reference frame

　　A reference frame in which Newton’s First Law is true. Two inertial reference frames move at a constant velocity relative to one another. According to the first postulate of Einstein’s theory of special relativity, the laws of physics are the same in all inertial reference frames.

　　Instantaneous velocity

　　The velocity at any given instant in time. To be contrasted with average velocity, which is a measure of the change in displacement over a given time interval.

　　Internal energy

　　The energy stored in a thermodynamic system.

　　Inversely proportional

　　Two quantities are inversely proportional if an increase in one results in a proportional decrease in the other, and a decrease in one results in a proportional increase in the other. In a formula defining a certain quantity, those quantities to which it's inversely proportional will appear in the denominator.

　　Isolated system

　　A system that no external net force acts upon. Objects within the system may exert forces upon one another, but they cannot receive any impulse from outside forces. Momentum is conserved in isolated systems.

　　Isotope

　　Atoms of the same element may have different numbers of neutrons and therefore different masses. Atoms of the same element but with different numbers of neutrons are called isotopes of the same element.

　　sat物理必背的高频词汇：P开头

　　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 effect

　　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 effect.

　　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 useful 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 reflects the amount of energy that potentially could be released as kinetic energy or energy of some other form.

　　Power

　　Defined 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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