What is the typical period of the voltage source in the plasma pencil described?

• A. 2000 ns
• B. 1500 ns
• C. 1000 ns
• D. 500 ns

Answer: (C)

The typical period of a voltage source in systems like a plasma pencil is related to the frequency of the alternating current (AC) used to energize the system. The period is defined as the reciprocal of the frequency (T = 1/f).

In many applications, including plasma generation, frequencies are often in the range of megahertz (MHz). A system operating at a frequency of 1 MHz has a period of 1 microsecond (µs), which is equivalent to 1000 nanoseconds (ns). This aligns well with the frequency of plasma devices, as they typically operate at frequencies that allow for efficient excitation of gas to form plasma.

Thus, considering this context and the typical characteristics of plasma generation devices, a voltage source that provides energy in a time frame of 1000 ns is quite standard. This reflects the necessary parameters to sustain the plasma and achieve the desired effects in applications such as surface modification and sterilization.

This understanding of the relationship between frequency and period explains why the choice of 1000 ns is the typical period associated with the voltage source in the system described.