Rocco makes the graphic organizer shown to review the characteristics of transistors.
PNP Transistor
NPN Transistor
Which statement belongs in the region marked X?
The current flows toward the base from the emiter.
The base is more negative than the emitter.
The base is the center layer.
The main charge carriers are negative electrons.
Х

Protons have a positive charge and, collectively, give an element its atomic number.

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

I’m not sure about this question