Physics
X-rays region lies between

Visible and infra-red region
Ultraviolet and visible region
Short radio waves and long radio waves
Gamma-rays and ultraviolet region

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The emitter has the least concentration of impurity
The base has the least concentration of impurity
The collector has the least concentration of impurity

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