The main advantage of using micro waves for communications is

Dielectric constant and conductivity of rocky soil and flat sandy soil are around

In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to

Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.

Reason (R): Waveguide has high power handling capacity, low loss and simple structure.

Consider the following statements about a magic tee

1. The collinear arms are isolated from each other.
2. On of the collinear arms is isolated from E arm.
3. On of the collinear arms is isolated from H arm.
4. E and H arms are isolated from each other.

Of the above statements