The height of a transmitting antenna located at the top ofa tower is 80m and that of a receiving antenna is 320m. If the radius of the earth is 6.4 x10'5 m. then what should be the maximum distance between them for the satisfactory communication in LOS mode?

What is the correct value of the temperature coeff‌icient, if the resistance of a field coil is 60 Q at 30°C and 80 Q at 90°C?

In accordance with the classical electromagnetic theory, what is the approximate initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom?

Which of the following options is the approximate range of resistivity of the semiconductors?

Which of the following options is a device that is used for converting one form of energy into another?

types of wave has these characteristics? i) The wave travels in a straight line from transmitting antenna to the receiving antenna. ii) It is used for line-of-sight communication.

One's weightlessness in space has most to do with _______.

Jupiter is 317 times more massive than the earth. its gravitational attraction is _____ earth's.

Ammeters should be connected ________ with the circuit being tested.

_____ are especially vulnerable to displaced aggression.

When steam condenses into water, __________.