Which of the resistance networks of figure can be used as 3 bit R-2R ladder DAC. Assume $${V_0}$$ corresponds to LSB.

The number of Boolean functions that can be generated by n variable is equal to:

A 300 MHz plane E.M. wave is propagating in free space. The wave is incident normally on an infinite copper slab. For the transmitted wave in the copper slab, calculate the following

(a) Attenuation constant
(b) Phase constant
(c) Skin depth
(d) Phase velocity and
(e) Group velocity

for copper assume the following values
Conductivity $$\sigma = 5.8 \times {10^7}$$ $$mho/m$$
Permeability $$\mu = 4\pi \times {10^{ - 7}}$$ $$H/m$$
Permeability $$\varepsilon = {1 \over {36\pi }} \times {10^{ - 9}}$$ $$F/m$$

Choose the correct statements.
For a wave propagating in an air filled rectangular wave guide