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10th Class Science Sources of Energy Question Bank Sources of Energy

  • question_answer
    The photoelectric threshold of a certain metal is \[\text{3}000\,\overset{\text{o}}{\mathop{\text{A}}}\,\] . If the radiation of\[\text{2}000\,\overset{\text{o}}{\mathop{\text{A}}}\,\] is incident on the metal, then                           

    A)  electrons will be emitted        

    B)  positrons will be emitted               

    C)  protons will be emitted                 

    D)  electrons will not be emitted            

    Correct Answer: A

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