Một kim loại có giới hạn quang điện 0,27μm. Chiếu lần lượt vào kim loại này các bức xạ có năng lượng photon ε1 = 3,11 eV; ε2 = 3,81 eV; ε3 = 6,3 eV và ε4 = 7,14 eV. Những bức xạ có thể gây ra hiện tượng quang điện cho kim loại này có năng lượng là         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Thanks to the advances in _____________ research, people now live a better and longer life.
   

• Choose the best answer for the following sentence:

  The _____________ often has a better impression when the candidates show their confidence.
   

• Choose the best answer for the following sentence:

  The group of doctors carried out an ____________ surgery to find out the reason leading to the criminal's death.
   

• Choose the best answer for the following sentence:

  Mammals have been in _____________ for many millions of years.
   

• Choose the best answer for the following sentence:

  He failed the exam because of the time ____________. He couldn't finish half of it.
   

• Choose the best answer for the following sentence:

  The way women's mind works is a _____________ to men. Therefore, they often misunderstand each other.
   

• Choose the best answer for the following sentence:

  We are in an unbalanced situation when women ______________ over 75% of our staff.
  
  

• Choose the best answer for the following sentence:

  In Western families, the child is often ___________ after the one his parents love most.
   

• Choose the best answer for the following sentence:

  I didn't know how to answer his question. There was a ____________ in our conversation.
  

• Choose the best answer for the following sentence:

  Small businesses are struggling in the present economic ___________.