Line of Sight

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 80 m. What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: Radius of earth = 6.4 xx 10^6 m )

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight ) mode ? (Given : radius of earth = 6.4xx10^(6) m).

A 50 MHz sky wave sky wave takes 4.04 ms to reach a receiver via re-transmission from a satellite 600 km above earth's surface. Assuming re-transmission time by satellite negligible, find the distance between source and receiver. If communication between the two was to be done by Line of sight (LOS) method,what should be the size of transmitting antenna ?

Assertion : Communication in UHF/ VHF regions can be established by space wave or tropospheric wave. Reason : Communication is UHF/VHF regions in not limited to line of sight distance but can be achieved for very large distances

A TV transmitting antenna is 128m tall.If the receiving antenna is at the ground level the maximum distance between them for satisfactory communication in line of sight mode is (radius of the earth 6.4times10^(6)m )

Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

A man wishes to estimate the distance of a nearby tower from him. He stands at a point A in front of the tower C and spots a very distant object O in line with AC. He then walks perpendicualr to AC upto B, a distaance of 100m and looks at O and C again. Since O is very distant, the direction of BO is practically the same as AO, but he finds the line of sight of C shifted from the original line of sight by an angle theta = 40^@ ( theta "is known as parallax"). Estimate the distance fo the tower C from his original position A.

An observers line of sight is at P, when container of diameter 30 cmand height 45 cm is empty.If this container is filled with liquid upto 30 cm height he is able to see the edge of container.Find refractive index of liquid.

Angle of elevation is the angle which line of sight makes with the horizontal. Angle of elevation of the top of a tall building is 30^(@) from a place A and becomes 60^(@) from another place B that is 10sqrt()3 m from A towards the building as shown in the figure. Height of the building is close to