In ground or surface wave propagation, the loss of power in...

Name: Problem 51, Chapter 28: Master Resource Book in JEE Main Physics
Uploaded: 2022-01-15T10:19:11-08:00
Duration: 54 s
Channel: Hast Aggarwal
Description: In ground or surface wave propagation, the loss of power in a signal wave is due to (a) induced charges in earth which travel in ground along with the wave, resulting the alternating currents in the earth surface (b) interface of waves (c) diffraction of waves (d) high frequency of signal wave

In ground or surface wave propagation, the loss of power in a signal wave is due to (a) induced charges in earth which travel in ground along with the wave, resulting the alternating currents in the earth surface (b) interface of waves (c) diffraction of waves (d) high frequency of signal wave

In ground or surface wave propagation, the loss of power in a signal wave is due to
(a) induced charges in earth which travel in ground along with the wave, resulting the alternating currents in the earth surface
(b) interface of waves
(c) diffraction of waves
(d) high frequency of signal wave

Key Concepts

Frequency Dependency of Signal Propagation

The attenuation of electromagnetic waves is often dependent on frequency, with higher frequencies generally experiencing greater losses due to increased absorption and scattering effects in the medium. In the context of ground or surface wave propagation, the characteristics of the Earth’s conductivity and the wave frequency together determine the extent of signal attenuation.

Diffraction in Wave Propagation

Diffraction is the physical phenomenon where waves bend or spread as they encounter obstacles or pass through apertures. Although diffraction is a general propagation effect that can redistribute wave energy and contribute to signal loss, it is distinct from the mechanisms involved in surface wave attenuation caused by induced currents.

Surface Wave Propagation

Surface wave propagation refers to the mechanism by which electromagnetic waves travel along the boundary between the Earth and the atmosphere. These waves are guided by the surface and can extend over long distances, but their interaction with the ground introduces specific attenuation effects that differentiate them from free?space propagation.

Ohmic Losses in Conductive Media

When electromagnetic waves propagate along the Earth’s surface, they induce currents in the conductive medium of the ground. These induced currents, known as ohmic currents, dissipate energy as heat due to the finite conductivity of the Earth, thereby reducing the power of the signal over distance.

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