A diode consists of a cylindrical cathode with radius 6.2 10 -2 cm mounted coaxially within a cylindrical anode of radius 0.5580cm.

A diode consists of a cylindrical cathode with radius 6.2  10–2cm mounted coaxiallywithin a cylindrical anode of radius 0.5580cm. The potential difference between theanode and the cathode is 350 V. An electron leaves the surface of the cathode withzero initial speed. Find its speed when it strikes the anode. The charge on an electronis 1.6  10–19C, and the electron mass is 9.1 10–31kg