Physics
The impurity atoms with which silicon should be doped to make p-type semiconductors are

Boron
Germanium
Antimony
Phosphorus

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with different velocity on the earth
They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth

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