Which of the following represents correc...

Which of the following represents correct order of conductivity in solids ?

A

`K_("metals")gtgtK_("insulators")ltK_("semiconductors")`

B

`K_("metals")ltltK_("insulators")ltK_("semiconductors")`

C

`K_("metals")~=K_("semiconductors")gtK_("insulators")="zero"`

D

`K_("metals")ltK_("insulators")gtK_("semiconductors")ne"zero"`

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The correct Answer is:

A

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