In short wave communication wave of which of the following...

In short wave communication wave of which of the following frequencies will be reflected back by the ionosphere layer having electron density $1.23 \times 10^{12} \mathrm{~m}$
(A) $2 \mathrm{MHz}$
(B) $10 \mathrm{MHz}$
(C) $12 \mathrm{MHz}$
(D) $18 \mathrm{MHz}$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Shortwave Communication

Shortwave communication involves the use of high frequency (HF) radio waves, which are capable of long-distance transmission due to their ability to reflect off the ionosphere. Understanding the interplay between the wave frequency, plasma frequency, and ionospheric conditions is key to effectively utilizing and optimizing shortwave radio communication links.

Ionospheric Reflection

Ionospheric reflection is the phenomenon where radio waves are bent or reflected back to Earth by the ionosphere, a layer of the upper atmosphere ionized by solar radiation. This process is critical for long-distance radio and short wave communications, as it allows signals to travel beyond the horizon by 'bouncing' between the ionosphere and the Earth's surface.

Plasma Frequency

The plasma frequency is the characteristic natural frequency of oscillation of the electrons in a plasma. It directly depends on the electron density of the medium and sets a critical threshold; radio waves with frequencies below this value are reflected, while those above may penetrate the plasma. This concept is essential in determining the reflection properties of the ionosphere in radio communications.

Transcript

Please give Ace some feedback