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WB JEE Medical WB JEE Medical Solved Paper-2006

  • question_answer
    Carbon, silicon and germanium atoms havefour valence electrons each. Their valence andconduction bands are separated by energyband gaps represented by \[{{({{E}_{g}})}_{C}},{{({{E}_{g}})}_{Si}},\] and\[{{({{E}_{g}})}_{Ge}}\]respectively. Which one of the followingrelationships is true in their case ?

    A)  \[{{({{E}_{g}})}_{C}}>{{({{E}_{g}})}_{Si}}\]           

    B) \[{{({{E}_{g}})}_{C}}={{({{E}_{g}})}_{Si}}\]

    C) \[{{({{E}_{g}})}_{C}}<{{({{E}_{g}})}_{Ge}}\]          

    D)  \[{{({{E}_{g}})}_{C}}<{{({{E}_{g}})}_{Si}}\]

    Correct Answer: A

    Solution :

                     Carbon,   silicon   and   germanium  are semiconductors. \[{{(Eg)}_{C}}=5.2\,eV\] \[{{(Eg)}_{Si}}=1.21\,eV\] \[{{(Eg)}_{Ge}}=0.75\,eV\] Thus, \[{{(Eg)}_{C}}>{{(Eg)}_{Si}}\]and \[{{(Eg)}_{C}}>{{(Eg)}_{Ge}}\]


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