The Navy sets an upper limit for sonic frequencies at 10,000 hertz and a lower limit at what value?

The Navy sets an upper limit for sonic frequencies at 10,000 hertz and a lower limit at what value?

• A. 15 Hz
• B. 10 Hz
• C. 5 Hz
• D. 1 Hz

Answer: (A)

Frequency ranges are defined by a lower and an upper limit, and every frequency within that band lies between those bounds. If the upper limit for sonic frequencies is 10,000 Hz, the lower limit must mark where the sonic band starts, not dip into infrasonic territory. Among typical boundary options, 15 Hz sits just above the infrasonic region and below the upper limit, establishing a practical sonic range from 15 Hz to 10,000 Hz. The other choices (10 Hz, 5 Hz, 1 Hz) fall into infrasonic frequencies, which are outside the sonic band, so they aren’t suitable as the lower limit. Hence, 15 Hz is the correct lower bound.

Frequency ranges are defined by a lower and an upper limit, and every frequency within that band lies between those bounds. If the upper limit for sonic frequencies is 10,000 Hz, the lower limit must mark where the sonic band starts, not dip into infrasonic territory. Among typical boundary options, 15 Hz sits just above the infrasonic region and below the upper limit, establishing a practical sonic range from 15 Hz to 10,000 Hz. The other choices (10 Hz, 5 Hz, 1 Hz) fall into infrasonic frequencies, which are outside the sonic band, so they aren’t suitable as the lower limit. Hence, 15 Hz is the correct lower bound.