Which of these waves will pass through the ionosphere as a means of sending signals to satellites for mobile phone or tv signal communication?

What instrument is used to measure liquid volume?

Adiagram show how a converging lens can produce a real image and virtual image

Zamir and talia raced through a maze. zamir walked 2 m north, 2 m east, 4 m south, 2 m east, 4 m north, 2 m east, 3 m south, 4 m east and 4 m north. talia walked 2 m north, 6 m east, 3 m south, 4 m east, and 4 m north. compare their displacements: zamir's displacement is talia's displacement.