单词	noise
释义	noise 1 Any undesired sound. It is measured on a decibel scale ranging from the threshold of hearing (0 dB) to the threshold of pain (130 dB). Between these limits a whisper registers about 20 dB, heavy urban traffic about 90 dB, and a heavy hammer on steel plate about 110 dB. A high noise level (industrial or from overamplified music, for example) can cause permanent hearing impairment. 2 Any unwanted disturbance within a useful frequency band in a communication channel. Noise: decibel scale
随便看	iconoscope icosahedron ideal crystal ideal gas ideal solution identity ignition temperature illuminance image image converter image intensifier imaginary number immersion objective impact printer impedance Imperial units implosion impulse incandescence inclination incoherent scattering incommensurate lattice indefinite integral indeterminacy index theorems

物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。