题干

一列简谐横波沿x轴正方向传播,t=0时波形图如图中实线所示,此时波刚好传到c点;t=0.6s时波恰好传到e点,波形如图中虚线所示,a、b、c、d、e是介质中的质点.下列说法正确的是(   )

A:这列波的周期为T=0.8s

B:当t=0.6s时质点a速度沿y轴负方向

C:质点c在这段时间内沿x轴正方向移动了3m

D:质点d在这段时间内通过的路程为20cm

E:t=0.6s时,质点e将要沿y轴正方向运动

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答案(点此获取答案解析)

A,D,E

同类题1

   The teacher stood before his class of 30 students and was going to hand out the final exam papers. “I know how hard you have all worked to get ready for this test.  he said. “And because I know you are all able to understand these questions. I am ready to offer a B to anyone who would prefer not to take the test."
    A number of students jumped up to thank the teacher and left the classroom. The teacher looked at the rest students and said. “Does anyone else want to get a B? This is your last chance. ”Two more students decided to go. Seven students stayed. The teacher then handed out the papers. There were only three sentences on the paper: Congratulations! You have received an A in this class. Keep believing in yourself.
    I never had a teacher who gave a test like that. but I think that it is a test that any teacher could and should give. Students who do not have confidence in what they have learned are B students at most.
    The same is true for students in real life. The A students are those who believe in what they are doing because they have learned from both successes and failures. They have learned life’s lessons. whether from school education or from events in their lives,and have become better people. Scientists say that by the age of eight,80% of what we believe about ourselves has already been formed. You are a big kid now and you realize that you have some limits(局限). However, there is nothing you can't do or leant to be. Sir Edmund Hillary, the first person to reach the top of Mount Qomolangma (珠穆朗玛峰)said,“We do not conquer the mountain, but ourselves. ”