Spatial pulse length is inversely proportional to frequency. Which statement best describes this relationship?

Spatial pulse length is inversely proportional to frequency. Which statement best describes this relationship?

• A. Inversely proportional
• B. Directly proportional
• C. Not related
• D. Proportional to strength

Answer: (A)

Spatial pulse length is tied to how long the pulse lasts in space, which depends on how many cycles are in the pulse and the length of each cycle (the wavelength). The wavelength equals the speed of sound divided by frequency. If the pulse has a fixed number of cycles, increasing frequency makes each cycle shorter, so the total pulse length in space gets shorter. That’s an inverse relationship: higher frequency yields a shorter spatial pulse length, and lower frequency yields a longer one. For instance, doubling the frequency while keeping the same number of cycles roughly halves the SPL. The other options describe relationships that don’t match this behavior: SPL does not increase with frequency, nor is it unrelated to frequency or governed by amplitude.

Spatial pulse length is tied to how long the pulse lasts in space, which depends on how many cycles are in the pulse and the length of each cycle (the wavelength). The wavelength equals the speed of sound divided by frequency. If the pulse has a fixed number of cycles, increasing frequency makes each cycle shorter, so the total pulse length in space gets shorter. That’s an inverse relationship: higher frequency yields a shorter spatial pulse length, and lower frequency yields a longer one. For instance, doubling the frequency while keeping the same number of cycles roughly halves the SPL. The other options describe relationships that don’t match this behavior: SPL does not increase with frequency, nor is it unrelated to frequency or governed by amplitude.