2018 AAPT PHOTO 物理摄影大赛国际获奖作品鉴赏！

美国高中生物理摄影大赛由美国物理教师协会AAPT主办，由参赛选手拍摄一张生活中或者特意设计的可以巧妙反应深刻物理现象、物理原理的照片，然后配上不多余250字（英文）的物理解释说明。下面就让我们来欣赏2018 AAPT PHOTO 物理摄影大赛国际获奖作品吧！

获奖作品赏析：

【Ring around the Rainbow】

This photo of a halo was taken in Jackson Hole, Wyoming. A halo is an optical phenomena, composed of rings of light that circle the sun, produced by the interaction of light with ice crystals in the atmosphere. This process is different from a rainbow because rainbows are formed from water droplets and appear when the sun is behind the viewpoint of the rainbow. In the case of rainbows, the light is not only refracted, but reflected off the back side of the water droplets and then is refracted once again back out. At high enough altitudes, water vapor condenses and freezes into ice crystals; Jackson Hole is located at an altitude of about 6,000 feet above sea level, making it possible for the halo to appear. Specifically, this is a ring of light observed from a 22 degree angle with the sun, more commonly known as a 22 degree halo. Light is refracted twice when going through an ice crystal; in the case of this halo, the refractions bend the light by 22 degrees. Light passing through ice crystals acts very similar to light through a prism; the light enters the crystal at an angle, and different colors of light are refracted out of the crystal at different angles.

——2018年自然类第二名 by Aurelia Eden Balkanski

【splashed water turned into ice】

This photo was taken at the Bashang Grassland. The temperature was very cold. When the sun rised, it was around negative 20 degree Celsius. When I splashed hot water from a cup, it turned into small ice crystals in the sky immediately. The reason why it freezed so fast is that hot water evaporates faster than cold water. So it turns into small water droplets easier. Thus, the water droplets become ice crystals in a very short period of time. Low temperature environment and hot water together form this amazing scene!

——2018年设计类第三名 by LUANYIN HUANG

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