During ground wave propagation the transmitted waves gets attenuated because

Options

A. earth surface absorbs the waves
B. frequency of the waves are too low
C. energy content of these waves are high
D. earth surface offers resistance

Explanation

### Step-by-Step Solution:

1. **Understanding Ground Wave Propagation**: Ground wave propagation refers to the transmission of radio waves along the surface of the Earth. These waves follow the curvature of the Earth and are used for communication over long distances.

2. **Identifying the Cause of Attenuation**: During ground wave propagation, the transmitted waves experience attenuation, which means they lose strength or energy as they travel. This attenuation can be attributed to several factors.

3. **Eddy Currents Induction**: As the radio waves propagate, they induce charges on the Earth's surface. This induced charge creates what are known as eddy currents. Eddy currents are loops of electrical current that are induced within conductors by a changing magnetic field.

4. **Resistance Offered by Earth**: The Earth’s surface has a certain level of conductivity, but it is not perfect. The presence of eddy currents means that there is resistance to the flow of these currents. This resistance leads to energy loss in the form of heat, which contributes to the attenuation of the transmitted waves.

5. **Conclusion on the Correct Reason**: The primary reason for the attenuation of transmitted waves during ground wave propagation is that the Earth's surface offers resistance to the induced currents. This resistance causes the waves to lose strength as they propagate.

### Final Answer:
During ground wave propagation, the transmitted waves get attenuated because the Earth's surface offers resistance to the induced currents.

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