Deduce an expression for the distance at which T.V.signals can directly be received from a T.V.tower of height h.

A T.V. tower has a height of 125 m. What is the maximum distance and area upto which this T.V. trasmission can be received? (Given: Radius of earth = 6.64 xx 10^(6)m )

The electric powr consumed by a device may be calculate by using either of the two expression P=I^2R or P=V^2/R . The first expression indicates that it is directly proprotinal to R whereas the second expression indicates inverse proportiionality. How can the seemingly difference dependece of P on R in these expression be explained?

From the top of a tower, the angle of depression of a point on the ground is 60^@ . If the distance of this point from the tower is 1/(sqrt3+1) metres, then the height of the tower is :

If the velocity of a radiowave be unity, find ithe distance of an aeroplane from the radar. If the radio signal is received back by the radar in 8.4 mus .

Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known ?

A T.V. tower has a height of 80 m. What is the maximum distance upto which this T.V. transmission can be received?