1 A metal with an extraction work of 2.00 V is illuminated with monochromatic light Energy 4.25 eV. What is the stop potential module for this experiment? 2 A pipe with an open end and a closed end produces a frequency Fundamental of 290 Hz. How long is it? (The speed of sound in the air is 340 m/s.) 3) Two loaded parallel plates A and B, located as shown in the figure, produce a Electric field in the x direction of intensity Ex = +400 V/m. The electrical potential on the Central plane x = 0 is V= 0. A starting electron of x= 0 with a speed vy= +1.50 x 107 M/s, as shown. What is its kinetic energy when it reaches plate A? Give the Answer in ev