An elecetron has a mass of 9.11 * 10^-31 kg. If it moves across a television picture tube at a speed of 5.0 * 10^5 m/s. Calculate:
a) it's kinetic energy
b)how many such electrons would transfer 1 J of energy to the screen.
sakonpure6 said:My answer to a) is 1.14 * 10^-19 J, which is correct.
My answer to b) is 1.14 * 10^19, which is not correct. The correct answer is 8.8 * 10^18. How did they get that? because if 1 electron has 1.14 * 10^-19 J then won't we need 1.14 * 10^19 electrons for 1 J ?
The number of electrons needed to transfer 1 J of energy to a screen depends on the type of screen and the energy level of the electrons. In general, it would take approximately 6.24 x 10^18 electrons to transfer 1 J of energy.
Yes, the number of electrons needed can vary depending on factors such as the energy level of the electrons, the type of screen, and the efficiency of the transfer process.
Energy is transferred from electrons to a screen through a process called electron emission. This occurs when the electrons collide with the screen's surface, causing energy to be transferred to the screen.
The relationship between energy and the number of electrons needed for transfer is directly proportional. This means that as the energy level increases, the number of electrons needed for transfer also increases.
No, not all electrons are able to transfer energy to a screen. Only electrons with enough energy (kinetic energy) and the right trajectory (direction of movement) can successfully transfer energy to a screen.