Show that, in a li. h. nonconducting region rather 'where 0 and j, 0, the fields e and b can be found completely from a vector potential, that is, ф-const. (zero is usually chosen). what two first. equations determine a? etiza- time, m oten- 22-7 consider a region where p,-0, j, -0, =0, while p is a given function of posi- the tion and time. show that (22-4) and (22-5) nd can be satisfied and the electromagnetic field ob- such that a l from a single vector

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

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