South Carolina Speed Measurement Device (SMD) Practice Test

The correct wavelength for the X-Band is approximately 1.1 inches. The X-Band is defined within the microwave frequency range of about 8.0 to 12.0 gigahertz. To understand how this wavelength is calculated, it’s essential to know that wavelength is inversely related to frequency, as given by the equation: \[ \text{Wavelength} = \frac{c}{f} \] where \( c \) is the speed of light (approximately \( 12 \times 10^9 \) inches per second) and \( f \) is the frequency in gigahertz. Using this relationship, when you input a typical frequency from the X-Band range (for instance, around 10 GHz), you find that the wavelength comes out to about 1.1 inches. This understanding assists in various applications, including radar and other speed measurement systems, where knowing the specific wavelength allows for effective operation and calibration of equipment.