QuestionIs a noise of -1 decibels audible, harmful, ultrasonic, or subaudible? Choose one: a. b. c. d.
Studdy Solution
STEP 1
Assumptions1. The noise level is -1 decibels (dB).
. The human hearing range is generally considered to be from20 Hz to20,000 Hz.
3. The decibel scale is logarithmic, and a decrease of10 dB represents a tenfold decrease in sound intensity.
4. The threshold of human hearing is generally considered to be0 dB, but this can vary depending on the individual and frequency.
5. Sounds below the threshold of hearing are considered subaudible.
6. Sounds above a certain level (typically around120 dB) can be harmful to human hearing.
7. Ultrasonic sounds are those that are above the human range of hearing, typically above20,000 Hz. This is not directly related to the decibel level.
STEP 2
Given the noise level is -1 dB, we need to determine which category it falls into based on the assumptions.
STEP 3
Since -1 dB is below the general threshold of human hearing (0 dB), it falls into the category of subaudible.
The correct answer is (d) subaudible.
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