Cường độ âm tại một điểm trong môi trường truyền âm là 10^-5W/m². Biết cường độ âm chuẩn là I₀ = 10^-12W/ m². Mức cường độ âm tại điểm đó bằng:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  Almost all books have few errors in them because of the care taken to check their proof pages before the final printing.

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

  If drivers obeyed the speed limit, fewer accidents occur.

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

  easy                           treat                        hearing                     please

• Choose a word that has different stress pattern:

  habitat                      consider                       natural                        medical

• 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