The ratio of thermionic currents $(I / I)$ for a metal when the temperature is slowly increased $T_0$ to $T$ as shown in figure. ( $I$ and $I$ are currents at $T$ and respectively). Then which one is correct?

Image

  • A(a) $A$
  • B(b) $B \quad T / T_0$
  • C(c) $C$
  • D(d) $D$
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