The doping level in a transistor is minimum for its __________ (fill in the gap)

1/(sqrtmu_0in_0) =__________ (fill in the gap)

A positron has same mass as that of __________ (fill in the gap)

Refractive index of glass is the maximum for _________ colour. (Fill in the gap)

The value of permeability of free space is __________ (Fill in the gap).

The resistance of a wire is 2Omega . If its is stretched to double its length then its resistance will be _______ (fill in the gap)

The radius of the thrid Borh orbit for hydrogen is 4.5 A^@ . The radius of fourth Bohr orbit is ____ (fill in the gap)