The sound of loudness of sound in the range of \(15 \mathrm{~B}-16 \mathrm{~B}\) is (1) not audible (2) just audible (3) moderate (4) painful to the ear

The loudness of a sound is measured in decibels (dB). The decibel scale is logarithmic, meaning a small change in decibels represents a large change in sound intensity. The scale typically ranges from 0 dB (the threshold of human hearing) to around 140 dB (threshold of pain).

We are given a range of 15 dB to 16 dB and need to determine the loudness of sound within this range. Comparing this range to the decibel scale, we can identify the level of loudness.

Based on the decibel scale, sounds within the range of 15 dB to 16 dB can be categorized as follows: (1) not audible : Sounds below the threshold of human hearing (0 dB) are considered not audible. (2) just audible : Sounds around the threshold of human hearing (0 dB to 20 dB) are considered just audible. This range includes whispers and rustling leaves. (3) moderate : Sounds ranging from 20 dB to 60 dB are considered moderate. This includes normal conversation and a quiet classroom. (4) painful to the ear: Sounds above 120 dB are considered painful to the ear. These include loud concerts, firearms, and jet engines. Now, we can compare the given range of 15 dB to 16 dB to the categories above and choose the appropriate option.

Comparing the given range of 15 dB to 16 dB to the categories explained in Step 3, we can see that this range is in the "just audible" category. Thus, the correct option is: (2) just audible