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(毕业卷) 一、填空题(每空3分,共60分) 1.当人站在竖直的平面镜前5米处时,人与像的距离为____米;若人以2米/秒的速度向平面镜走去,则像向平面镜移动的速度为____米/秒。 2.一束光线从空气射入某种透明液体,已知入射光线与法线的夹角为45°,反射光线与折射光线的夹角为105°,则反射角的大小是____;折射角的大小是____。 3.在热传递的三种方式中,能够在真空中传热的方式是____。 4.100克氢气完全燃烧后,放出3400千卡的热量,氢气的燃烧值是____千卡/千克。 5.在物态变化中,能放出热量的三种变化形式是____、____,____;只从液体表面发生的汽化现象叫____。 6.将一滴红墨水滴在一杯清水中,过一段时间后,整杯清水都变红了,这种现象叫____,它说明分子是在____。
(Graduation volume) I. Fill in the blanks (3 points for each space, total 60 points) 1. When a person stands 5 meters in front of the vertical plane mirror, the distance between the person and the image is ____ meters; if the person is 2 meters The speed of / second goes to the plane mirror, and the speed of moving to the plane mirror is ____ meters/second. 2. A beam of light from the air into a transparent liquid, known incident light and the normal angle of 45 °, the angle between the reflected light and refracted light is 105 °, the size of the reflection angle is ____; refraction The size of the corner is ____. 3. In the three modes of heat transfer, the heat transfer in the vacuum is ____. 4.100 grams of hydrogen gas after complete combustion, release 3400 kcal of heat, the hydrogen combustion value is ____ kcal/kg. 5. In the change of state of matter, the three types of changes that can give off heat are ____, ____, ____; the phenomenon of vaporization that occurs only from the surface of the liquid is called ____. 6. Drop a drop of red ink in a glass of clear water. After a period of time, the whole glass of clear water turns red. This phenomenon is called ____. It shows that the molecule is in ____.