Một nguồn O dao động với tần số tạo ra sóng trên mặt nước. Biết khoảng cách giữa 11 gợn lồi liên tiếp là 1m. Vận tốc truyền sóng trên mặt nước bằng:         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  special                         impairment                          develop                        improvement

• Find a mistake in the four underlined parts of the sentence and correct it:

  We should try to contact him, should we?

• Choose a word that has different stress pattern:

  fascinating                          occasionally                         communicate                         behavior

• Find a mistake in the four underlined parts of the sentence and correct it:

  I was extremely tired because of I hadn't slept the night before.

• Find a mistake in the four underlined parts of the sentence and correct it:

  If you had the chance to meet famous writers, what do you ask them?

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

  touch                      choose                       research                       school

• Find a mistake in the four underlined parts of the sentence and correct it:

  They were several reasons why he couldn't perform in the concert.

• Find a mistake in the four underlined parts of the sentence and correct it:

  If he didn't speak so quick, we could understand him.

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

  improve                        lose                        consider                      choose

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

  spirit                       despite                     animal                  disturb