Pressure Speed Boundary Three-Row Scan - Electromagnetic Waves and Radiation Step by Step

A pressure-speed-boundary scan holds the transmitted intensity fixed and varies the wave speed across three rows, checking that the absorber pressure p = I / c falls as the speed rises row by row. The arithmetic is exact only for the stated pressures, wave speeds, intensities, and rows in the ideal uniform-wave model. Real measurements add bandwidth, alignment, detector calibration, polarizer extinction ratio, material dispersion/loss, finite precision, and measurement uncertainty.

At fixed transmitted intensity, absorber pressure falls as speed rises. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Fixed intensity gives lower pressure at higher speed

The absorber mode and transmitted intensity stay fixed. The checked pressure is the intensity divided by the displayed training speed.

p={I\over c}={12\ \text{W}/\text{m}^{2}\over4\ \text{m}/\text{s}}=3\ \text{Pa}

Fixed intensity gives lower pressure at higher speed

The absorber mode and transmitted intensity stay fixed. The checked pressure is the intensity divided by the displayed training speed.

p={I\over c}={12\ \text{W}/\text{m}^{2}\over6\ \text{m}/\text{s}}=2\ \text{Pa}

Fixed intensity gives lower pressure at higher speed

The absorber mode and transmitted intensity stay fixed. The checked pressure is the intensity divided by the displayed training speed.

p={I\over c}={12\ \text{W}/\text{m}^{2}\over12\ \text{m}/\text{s}}=1\ \text{Pa}