What unit is used for wavelength in noise measurements?

What unit is used for wavelength in noise measurements?

• A. Meters per cycle
• B. Feet per cycle
• C. Cycles per second
• D. Seconds per cycle

Answer: (B)

Wavelength is the distance the wave travels in one complete cycle. In noise measurements, this distance is expressed as length per cycle, which is why feet per cycle is used (or meters per cycle in metric units). This makes sense because wavelength can be found from lambda = v / f, where v is the speed of sound and f is the frequency. If v is in feet per second and f is in cycles per second, their ratio gives feet per cycle. The other two options refer to frequency (cycles per second) and time per cycle (seconds per cycle), not distance per cycle, so they don’t describe wavelength.

Wavelength is the distance the wave travels in one complete cycle. In noise measurements, this distance is expressed as length per cycle, which is why feet per cycle is used (or meters per cycle in metric units). This makes sense because wavelength can be found from lambda = v / f, where v is the speed of sound and f is the frequency. If v is in feet per second and f is in cycles per second, their ratio gives feet per cycle.

The other two options refer to frequency (cycles per second) and time per cycle (seconds per cycle), not distance per cycle, so they don’t describe wavelength.