¿cual es la longitud de un cable de latón al disminuir la temperatura a -25 grados celsius, si son una temperatura de 72 grados Celsius mide de 102m?

Figure shows a simple cathode-ray tube. a beam of particles, emitted by the cathode, strikes the centre of the screen.a. why the cathode must be heated? b. what is the principal energy change that occurs when the beam strikes the screen? c describe and explain what you would expect if the two deflecting plates g and h were connected to an alternating voltage supply