SAT2物理常用术语词汇（R）

　　为了方便广大考生更好的复习，小编综合整理了SAT2物理常用术语词汇，以供各位考生考试复习参考,希望对考生复习有所帮助。>>免费申请出国留学<<

　　Radian

　　A unit for measuring angles; also called a “rad.” 2π rad = 360o.

　　Radiation

　　Heat transfer via electromagnetic waves.

　　Radioactive decay

　　The process by which unstable nuclei spontaneously release particles and/or energy so as to come to a more stable arrangement. The most common forms of radioactive decay are alpha decay, beta decay, and gamma decay.

　　Radioactivity

　　An object is called radioactive if it undergoes radioactive decay.

　　Radius of curvature

　　With spherical mirrors, the radius of the sphere of which the mirror is a part.

　　Raraction

　　An area of high air pressure that acts as the wave trough for sound waves. The spacing between successive raractions is the wavelength of sound, and the number of successive areas of raraction that arrive at the ear per second is the frequency, or pitch, of the sound.

　　Real image

　　An image created by a mirror or lens in such a way that light does actually come from where the image appears to be. If you place a screen in front of a real image, the image will be projected onto the screen.

　　Rlect

　　A wave on a string that is tied to a pole at one end will rlect back toward its source, producing a wave that is the mirror-image of the original and which travels in the opposite direction.

　　Rlected ray

　　The ray of light that is rlected from a mirror or other rlecting surface.

　　Rlection

　　The phenomenon of light bouncing off a surface, such as a mirror.

　　Rracted ray

　　The ray of light that is rracted through a surface into a different medium.

　　Rraction

　　The bending of light as it passes from one medium to another. Light rracts toward the normal when going from a less dense medium into a denser medium and away from the normal when going from a denser medium into a less dense medium.

　　Restoring force

　　The force that causes simple harmonic motion. The restoring force is always directed toward an object’s equilibrium position.

　　Right-hand rule

　　A means of dining the direction of the cross product vector. To dine the direction of the vector , position your right hand so that your fingers point in the direction of A, and then curl them around so that they point in the direction of B. The direction of your thumb shows the direction of the cross product vector.

　　Rigid body

　　An object that retains its overall shape, meaning that the particles that make up the rigid body stay in the same position relative to one another.

　　Rotational kinetic energy

　　The energy of a particle rotating around an axis.

　　Rotational motion

　　Occurs when every point in the rigid body moves in a circular path around a line called the axis of rotation.

　　Rutherford nuclear model

　　The model of the atom according to which negatively charged electrons orbit a positively charged nucleus. This model was developed by Ernest Rutherford in light of the results from his gold foil experiment.

　　小编提醒：单词的记忆要靠长期的坚持，考生们一定要持之以恒，每天都拿出来看一看背一背，让这些词汇在大脑中形成长期记忆，这样就不会轻易地忘记背过的词汇了。