When the distance between two cities is great. Which unit of measurement is choosen ?

What is the distance between two consecutive nodes?

What is the distance between two consecutive antinodes or nodes?

Hertz,in his historical experiment ,produced stationary electromagnetic waves and measured the distance between two successivendoes.Explain,how this measurement enabled him to show that the electromgnetic waves travelled with the same speed as the speed of lght.

What is the shortest distance between two intersecting lines?

The distance between the two parallel lines is 1 unit. A point 'A' is chosen to lie between the lines at a distance 'd' from one of them. Triangle ABC is equilateral with B on one line and C on the other parallel line. The length of the side of the equilateral triangle is

A body is released from a great height and falls freely towards the earth. Exactly one sec later another body is released. What is the distance between the two bodies 2 sec after the release of the second body ?

What is the distance between the two points which have a phase difference of 2pi ?