Answer the following questions. 200 word of each question and a reference of them.
1. Why does the final electron energy not depend on the grid voltage?
2. Can you think of a reason as to why the cathode is not directly heated by current?
3. Do you think the electrons emitted from the cathode with zero velocity, one velocity, or a range of velocities? Hint: The electrons inside the metal that are able to escape are a bit like a gas of molecules at finite temperature.
4. The coils are connected in series. Why would connecting them in parallel be a bad idea?
5. Why doesn't the magnetic field change the speed of the electrons? (Speed is taken to be the magnitude of the velocity. The velocity is a vector.)
6. At 5 A, what is the magn-etic field produced at the center of the Helmotz coils in gauss? About what is the magnitude of the Earth's field in gauss?
7. What would be the electron orbits if the initial velocity of the electrons was parallel or anti-parallel to the magnetic field?
8. What would be the electron orbits if the initial velocity of the electrons was 45 degrees to the magnetic field?