北京新航道为考生指导SAT考试并且为需要的学子提供SAT培训。SAT备考尤其重要，下面我们为考生整理了一些关于SAT2物理常用术语，希望帮助考生备考SAT提供一些帮助和借鉴。

 

　　The following list defines all of the bold-faced words you encountered as you read this book.

 

　　D

 

　　De Broglie wavelength

 

　　A wavelength, given by = h/mv, which is associated with matter. Louis de Broglie proposed the idea that matter could be treated as waves in 1923 and applied this theory successfully to small particles like electrons.

 

　　Decay constant

 

　　A constant, , not to be confused with wavelength, that defines the speed at which a radioactive element undergoes decay. The greater is, the faster the element decays.

 

　　Decibel

 

　　A logorithmic unit for measuring the volume of sound, which is the square of the amplitude of sound waves.

 

　　Deposition

 

　　The process by which a gas turns directly into a solid because it cannot exist as a liquid at certain pressures.

 

　　Destructive interference

 

　　The cancellation of one wave by another wave that is exactly out of phase with the first. Despite the dramatic name of this phenomenon, nothing is “destroyed” by this interference—the two waves emerge intact once they have passed each other.

 

　　Diffraction

 

　　The bending of light at the corners of objects or as it passes through narrow slits or apertures.

 

　　Diffraction grating

 

　　A sheet, film, or screen with a pattern of equally spaced slits. Typically the width of the slits and space between them is chosen to generate a particular diffraction pattern.

 

　　Direction

 

　　The property of a vector that distinguishes it from a scalar: while scalars have only a magnitude, vectors have both a magnitude and a direction. When graphing vectors in the xy-coordinate space, direction is usually given by the angle measured counterclockwise from the x-axis to the vector.

 

　　上面就是我们列举的SAT2物理常用术语，大家在备考SAT一定要对词汇方面有更多更加详细的准备。最后，提醒大家，在备考时一定要自己多查看一些资料以及相关讯息，这样考试的时候就能轻松应对。祝各位考生考出好成绩。