This law states that the total power distributed over the surface of the sphere remains the same, but since the area of the sphere increases with the square of the distance from the source, Pd is inversely proportional to the square of the distance from the source.

For any incident angles greater than or equal to θicritical , there will be no refracted light at all and all the incident light will be reflected. This is called ________________________

If the decrease in density with height is less than normal (the actual density is greater than normal) then the beam bends more than normal and is curved more toward the earth's surface. This phenomenon is called _______________________.

Sunspots can, of course, occur unexpectedly, and the life span of individual sunspots is variable; however, a regular cycle of sunspot activity has also been observed. This cycle has both a minimum and maximum level of sunspot activity that occur approximately every ___________________

Will the angle of reflection remain equal to the angle of incidence on a smooth curved surface?

It is an electrical energy that has escaped into free space in a straight line at approximately the speed of light and are made up of magnetic and electric fields that are at right angles to each other and also with the direction of propagation.
electromagnetic wave

It is the modulation or redistribution of energy within a wavefront when it passes near the edge of an opaque (non-transparent) object.It is the phenomenon that allows radio waves to propagate (peek) around corners.

It is one of a theoretically infinite number of concentric ellipsoids of revolution which define volumes in the radiation pattern of a usually circular aperture.

It is the point in the Earth’s orbit at which it comes nearest to the Sun.

Occurs when two or more waves simultaneously occupy the same point in space.

It is the theorem stating that the rate of flow of electromagnetic energy per unit area equals the cross product of the electric and magnetic vectors.

Every point on a wave-front may be considered a source of secondary spherical wavelets which spread out in the forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets. This refer to _____________________.

It is the measurement technique to determine the critical frequency.

VERNAL (SPRING) EQUINOX - beginning of spring: the time when the Sun crosses the celestial equator and day and night are of equal length, marking the beginning of spring.
the southern hemisphere happens every __________________

It contains four cloud-like layers of electrically charged ions, which enable radio waves to be propagated to great distances around the Earth. This is the most important region of the atmosphere for long distance point-to-point communications.

It describes the relationship between the angles of the two light waves and the indices of refraction of the two materials

When surface imperfections are smaller than the wavelength of the incident light (smooth), virtually all of the energy is reflected equally exhibiting _______________ reflections.

Occurs when the refractive index is modified by changes in temperature gradient, pressure or water vapour content giving rise to a wide range of non-standard propagation conditions

occurs when the sun at noon is directly overhead the equator. During these two days of the year, all locations on Earth receive 12 hours of sunlight and 12 hours of darkness in a 24-hour period

It is the gradual variation in the refractive index of a transmission medium (atmosphere).

What is the critical angle of reflection of a radio wave traveling from water to air?

is a measurement of the amount of heat the Earth receives from the sun. This value is 1368 watts per square meter but fluctuates by as much as 0.4% per week or 0.1% over a regular period of 11 years as this affects the world’s climate.

Many jet aircrafts fly in this are because it is very stable. Also, the ozone layer absorbs harmful rays from the Sun can be found here.