Always use a sun-tan cream to protect your skin against the harmful effect of the sun's __. A.beamsB.raysC.lightD.shine 答案 B 解析 习惯用法。依题意应为“太阳光线”,而beam(光线的)束、柱ray光线,light光,日光,shine阳光,光亮。可见beam不合题意,light往往单独使用,shine与sun连用时,常用su...
How are gamma rays produced artificially? How do cosmic rays affect humans? Are all gamma rays shorter than x-rays? Why do gamma rays have no mass at all? Does alpha decay create gamma rays? Why is alpha radiation more ionizing than gamma radiation? What is one side effect of adaptive ...
The presence of the sun also provides leisure activities like sunbathing that can enhance the mood of an individual and prevent depressive episodes.Answer and Explanation: Ultraviolet (UV) rays are considered the harmful rays coming from the sun and other artificial sources like tannin...
a shield for tubular lamps for the emission of x-rays in the range of ultraviolet light, with measures to reduce the harmful effect of radiation directly.BARNESCHI MARIOSANTI ALDO
Light is composed of electromagnetic particles that travel in waves. These waves emit energy, and vary in length and strength. Wavelengths are measured in nanometers (nm). Every wavelength is represented by a different color and categorized into x-rays, ultraviolet (UV) rays, visible light, etc...
Common culprits include a cavity, a crack in your tooth or a condition called dentin hypersensitivity, among others3. The nature and duration of the tooth pain along with a dental examination and x-rays will help your dentist determine the cause of your discomfort and best course of action....
Photoprotective effect of melanin derived from White Silky Fowl on Drosophila melanogaster against ultraviolet radiation The Yellow strain of Drosophila was used to evaluate photoprotective power of melanin against ultraviolet radiation(UVR).Flies were firstly exposed to UVR ... Z Wang,X Deng,A Wang ...
Researchers at Skoltech are a step closer to a workingoptoacousticendoscopicprobe— a device that could slip inside a blood vessel and analyze atherosclerotic plaques by shining laser light on them and making them vibrate like a speaker membrane. This effect would cause the plaques to betray their...
Properties of ITO on plastics and glass by Nd : YAG laser deposition at 355 and 532 nm The highest optical transmission was 94% at 5 cm. The carrier concentration, of the order of 10(19) cm(-3) was determined from the Hall-effect ... Yong TK,Tou TY,Yang RB,... - 《Vacuum Tech...
According to Robert Park, a professor of physics at the University of Maryland in the US, the magnetic waves aren’t nearly powerful enough to break apart DNA, which is how known threats, such as UV rays and X-rays, cause cancer. ...