Thực hiện giao thoa ánh sáng với thiết bị của Y-âng, khoảng cách giữa hai khe a = 2 mm, từ hai khe đến màn D = 2 m. Người ta chiếu sáng hai khe bằng ánh sáng trắng (0,4 μm ≤ λ ≤ 0,75 μm). Quan sát điểm A trên màn ảnh, cách vân sáng trung tâm 3,3 mm. Hỏi tại A bức xạ cho vân tối có bước sóng ngắn nhất bằng bao nhiêu?           

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:

  May Day is day when workers in many countries are honored.

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

  Thanksgiving is a truly American holiday. Nobody should has dinner alone on that day.

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

  cough             though              thought                 eighty

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

  cutlery                 party                  carry                  reply

• Choose the correct sentence which is built from the words and phrases given:

  he / not / go / class / this / morning / nobody / know / why /
  
  

• Choose the correct sentence which is built from the words and phrases given:

  vase / break / it / no one / fault / .
  
  

• Choose the best answer for the following sentence:

  We refrained __________ talking until we knew that it was safe.

   

• Choose the best answer for the following sentence:

  There is a ______________ for unemployment to rise in the summer.

   

• Choose the best answer for the following sentence:

  Young guests often have willing ________________ in any kinds of entertainment.

    

• Choose the correct sentence which is built from the words and phrases given:

  everyone / like / her / because / she / kind / caring / teacher /.