题干

质谱分析技术已广泛应用于各前沿科学领域.汤姆孙发现电子的质谱装置示意如图,M、N为两块水平放置的平行金属极板,板长为L,板右端到屏的距离为D,且D远大于L,O′O为垂直于屏的中心轴线,不计离子重力和离子在板间偏离O′O的距离.以屏中心O为原点建立xOy直角坐标系,其中x轴沿水平方向,y轴沿竖直方向.设一个质量为m0、电荷量为q0的正离子以速度v0沿O′O的方向从O′点射入,板间不加电场和磁场时,离子打在屏上O点.若在两极板间加一沿+y方向场强为E的匀强电场,求离子射到屏上时偏离O点的距离y0

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答案(点此获取答案解析)

解:离子在电场中受到的电场力   Fy=q0E

离子获得的加速度ay= Fym0

同类题4

Values join us together and set us apart. Today, our society has a terrible lack(缺乏)of values. Here are some social values that everyone needs.
◆Respect
Respect means to respect(尊重)others in everyday life. Even if you are against a person, it is important to have respect. It is this respect that makes us human. Without this respect, we become  animals. We need to respect our friends for our friendships. We even need to respect our enemies, because they help us to grow up and be stronger. Respect is one of the crucial values in a relationship.
◆Love
Love is everything. With love in our hearts, we feel no need to hurt another. With love in our hearts, we will pay more attention to the similarities in opinions rather than the disagreement. If we want others to be good to us, we need to be good to them. After all, we give love to get love, right?
◆Loyalty
People often forget the meaning and importance of loyalty(忠诚). Loyalty is necessary for people to believe in each other. In no matter what kind of relationship, we need to believe in each other so that we can work together towards the same goal.
◆Honesty
Honesty is to show other people who we really are. Honesty helps us do better, because it makes us realize our problems and find ways to solve them. It is this honesty, that will make others help you out, not because you need it. But, because they have problems too, which you can help out with. This honesty will help us follow the other values in society and, truly, "heal the world"!