Một proton chuyển động theo một quỹ đạo tròn bán kính 5 cm trong từ trường đều B = 10-2 T. Biết khối lượng của proton bằng 1,72.10-27 kg. Chu kì chuyển động của proton là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The businessmen __________ many things in the fire.
   

• Choose one sentence that has the same meaning as the root one:

  Only the manager knows the details of the project.
  
  

• Choose the best answer for the following sentence:

  Can you write an article telling about one of your most memorable past ___________?
   

• Choose one sentence that has the same meaning as the root one:

  She has no intention to give up her hobby.
  
  

• Choose the best answer for the following sentence:

  How did the experience _____________ you?
   
  
  

• Choose the best answer for the following sentence:

  I phoned you last night but you were out. Where _____________ you go?
  
  

• Choose the best answer for the following sentence:

  When I got to the airport, the plane _____________ taken off.
   

• Choose the best answer for the following sentence:

  The police ________________ no attention to her complaint because she always made a fuss.
   

• Choose the best answer for the following sentence:

  The house was in great disorder because he ____________ it.
   

• Choose the best answer for the following sentence:

  The traffic was making so much noise that I couldn't hear what he ___________.