Trên một sợi dây đàn hồi đang có sóng truyền. Xét hai điểm A, B cách nhau một phần tư bước sóng. Tại thời điểm t, phần tử sợi dây tại A có li độ 0,5mm và đang giảm; phần tử sợi dây tại B có li độ 0,866mm và đang tăng. Coi biên độ sóng không đổi. Biên độ và chiều truyền của sóng này là:         

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Learning the ___________ skills and techniques may not be as fun and engaging for the players.
   

• Choose the best answer for the following sentence:

  Sea Shepherd and other anti-whaling protesters have continually harassed the Japanese whaling fleet in an effort to ______________ with Tokyo's hunting season, during which it takes hundreds of minke whales in the Antarctic.
  

• Choose the best answer for the following sentence:

  When he reached the point about the fundamental and radical law, his _____________ jumped up and began to protest.
   

• Choose the best answer for the following sentence:

  The only thing I can really complain about is our lack of being able to hit ___________ shots when they matter.
   

• Choose the best answer for the following sentence:

  The students were _______________ for showing up late for class.
   

• Choose the best answer for the following sentence:

  She received me kindly, and she got me a ______________ in a shop.
   

• Choose the best answer for the following sentence:

  A plan had to be devised to enable him to enter into successful _____________.
   

• Choose the best answer for the following sentence:

  ____________ are exploring whether organ transplant drugs made by Roche and Novartis increase the risk of an often-fatal neurological disease.
   

• Choose the word that has the underlined part pronounced differently from the rest:

  admiration                          milkmaid                        podium                        spirit

• Choose the word that has the underlined part pronounced differently from the rest:

  title                         preccision                           rival                       reunite