What is the marker spacing interval?

• A. 5 to 50
• B. 10 to 100
• C. 20 to 80
• D. 1 to 10

Answer: (B)

Marker spacing interval is about how far apart markers are placed to sample a fast event, like a detonation front, so you can track its progression with enough detail without overwhelming the setup. If markers are placed too close, you get a lot of data and potential interference between signals; if they’re too far apart, you risk missing important changes in the wave as it moves. The typical, practical range for this spacing is ten to one hundred units, which strikes a balance between capturing the front’s movement with good resolution and keeping the experiment manageable. Spacing choices at the lower end (like five to fifty) are denser than usual and can be unnecessary; at the upper end (twenty to eighty) you lose some resolution; spacing as tight as one to ten is often impractical due to the sheer number of markers required.