For an UJT employed for the triggering of an SCR, stand-off

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For an UJT employed for the triggering of an SCR, stand-off ratio h = 0.64 and dc source voltage V_BB is 20 V. The UJT would trigger when the emitter voltage is ______V.

1. 4.1
2. 13.1
3. 51
4. 3.1

Correct Option: B

E_BB = V_T + hV_BB = 0.3 + 0.64 × 20 = 13.1 V