Can someone help me with this introductory physics problem =====================

Question

Can someone help me with this introductory physics problem

============================================-

Before the advent of solid-state electronics, vacuum tubes were widely used in radios and other devices. A simple type of vacuum tube known as a diode consists essentially of two electrodes within a highly evacuated enclosure. One electrode, the cathode, is maintained at a high temperature and emits electrons from its surface. A potential difference of a few hundred volts is maintained between the cathode and the other electrode, known as the anode, with the anode at the higher potential. (Figure Figure 1 v of 1

Explanation / Answer

given

V = 205 volts

the mass of electron is m = 9.1 X 10-31 kg

charge is q = 1.6 X 10-19 C

using the equations are W = qV

and W = 1/2 m vfinal2

q V = 1/2 m vfinal2

vfinal = ( 2 q V / m )1/2  

vfinal = ( 2 X 1.6 X 10-19 X 205 / 9.1 X 10-31 )1/2  

vfinal = 8.49 X 106 m/sec

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---