Một nguồn sóng dao động với tần số góc 2π rad/s. Sóng được truyền đi trong môi trường đàn hồi với tốc độ v = 3 (m/s). Bước sóng bằng:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  In contrast, in Sweden, the number of computers, at 500, is _______________ the figure for televisions.
  
  

• Choose the best answer for the following sentence:

  In conclusion, it seems that although there are big differences between countries, computers are ___________ than televisions in most countries.
  
  

• Choose the best answer for the following sentence:

  Overall, Egypt and Iran account to the majority of goods whilst Sudan and Libya are _______________.
  
  

• Choose the best answer for the following sentence:

  The most obvious trend in the graph is that women have a ______________ salary in ______________ of the countries as described.
  
  

• Choose the best answer for the following sentence:

  The ________________ trend in the graph is the improvement in people's living standard between 1990 and 2000.
  
  

• Choose the best answer for the following sentence:

  ________________ people we can get to join the party, ______________ we can show that we have more influence.
  
  

• Choose the best answer for the following sentence:

  The sun's surface is about 100 times ________________ day on earth.
  
  

• Choose the best answer for the following sentence:

  After the wresting class, your son will improve his coordination, increase his endurance, and become ____________.
  
  

• Choose the best answer for the following sentence:

  There is also a section that provides tips on how parents can help their wrestlers be ____________ in the classroom.
   

• Choose the best answer for the following sentence:

  Prices __________ all the time. Everything is getting more and more expensive.