Question

65. In.. propagation low frequency radio waves hug the earth.
a. surface
b. tropospheric
c. ionospheric
d. Space​

Answer 1

Answer:

Surface

Explanation:

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Answer 2

Answer:

a) Surface

Explanation:

A surface wave is a mechanical wave that travels along the boundary between two different mediums in physics. Gravity waves on the surface of liquids, like ocean waves, are a typical example. At the boundary between two liquids with varying densities, gravity waves can also form inside liquids. Rayleigh or Love waves are examples of elastic surface waves that can move across the surface of solids. In order to travel along a gradient in refractive index or along the interface between two mediums with differing dielectric constants, electromagnetic waves can also travel as "surface waves." A ground wave in radio communication is a guided wave that travels close to the Earth's surface.

Hence ,  the answer to the question is a) Surface

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