用某种单色光照射植物使其发生光合作用，假设此种单色光的频率为v，每秒有n0个光子被植物吸收，又知每摩尔葡萄糖经呼吸作用分解为二氧化碳和水，放出的能量为Q，则经过一分钟，由光合作用产生了多少摩尔葡萄糖？以这种单色光照射某种金属板，能放出电子，已知遏止电压为U，则金属的逸出功为多少？
解：由呼吸作用分解每摩尔葡萄糖所放出的能量，可得光合作用合成一摩尔葡萄糖所需的能量，再由光子所带能量可得到l min合成多少葡萄糖，由遏止电压可得光电子的最大初动能，进而得到金属板的最大逸出功
1 min由植物吸收的光子所带的能量W=60n0hv
由每摩尔葡萄糖分解为CO2和水释放的能量为Q可知，每合成1 mol葡萄糖所需能量为Q，所以l min内合成葡萄糖的物质的量为
光电子的最大初动能
由hv=W+Ek，得逸出功W=hv-Ue
| 任务型阅读 (每空一词)。 | |||||||||||||||
| Animals are people's friends. Buy many wild animals are facing the danger of dying out, because the environment that they are living in has changed greatly. For example, their living area has become smaller and smaller because of the development of cities and the increasing of population (人口). They have no enough room to live in or enough food to eat. At the same time, men are trying their best to kill the animals just for getting their fur and skin, teeth and meat. People should realize how serious it is and something should be done to protect the animals. We should build some reserves, so that animals can live freely. And people should not be allowed to kill the endangered animals or eat their meat. We should do something to make our world cleaner. Fresh air, clean water and green grass are all important for animals. The death of the endangered animals will bring a disaster to human beings (人类). | |||||||||||||||
Research Report
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