Which of the following frequencies is suitable for beyond-the-horizon communication…

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Waves · Electromagnetic Waves

Problem

Which of the following frequencies is suitable for beyond-the-horizon communication using sky waves? (1)

10\,\text{kHz}

(2)

10\,\text{MHz}

(3)

1\,\text{GHz}

(4)

1000\,\text{GHz}