Question

In a laboratory experiment, an electron with a kinetic energy of 0.440 keV is shot toward another electron initially at rest (see figure below). (1 eV = 1.602 ✕ 10−19 J) The collision is elastic. The initially moving electron is deflected by the collision. (a) Is it possible for the initially stationary electron to remain at rest after the collision? Yes. However, this will only occur when the moving electron has a much higher kinetic energy than the question states. In that case, the angle of the deflected electron will be 90° in order to conserve momentum. No. Initially, there is no momentum in the y direction. Afterward, the first electron is moving in the positive y direction. The second must be moving in the negative y direction to conserve momentum. (b) The initially moving electron is detected at an angle of θ = 33.5° from its original path. What is the speed of each electron after the collision? v1f = m/s v2f = m/s

Answer 1