Assertion : In ionospheric reflection, phase change does not occur with the radio wave.

Reason : The ionosphere reflection is similar to the total internal reflection in miraj.

Assertion : Amplitude modulation shows more interference than frequency modulation with noise.

Reason : Interference is function of amplitude of modulation wave with carrier-wave.

A diode detector is used to detect and amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pF in parallel with a load resistance 100 k$$\Omega$$. Find the maximum modulated frequency which could be detected by it.