Final answer:
The word 'soundproof' is a 10-letter term that means impervious to sound, and it's crucial in environments like recording studios where noise reduction is significant. The intensity of sound is measured in decibels (dB), a unit that represents a logarithmic scale relative to 10⁻¹² W/m².
Step-by-step explanation:
A 10-letter word meaning impervious to sound is soundproof. This refers to a structure or material that prevents or greatly reduces the passage of sound. For instance, recording studios are often soundproofed to prevent external noise from interfering with the quality of the sound recordings. The decibel (dB) is a unit used to measure the intensity level of sound, and soundproofing materials might be rated by their efficacy in reducing noise in terms of decibels. Large differences in sound intensity are expressed logarithmically because human ears perceive sound on a logarithmic scale, hence the decibel scale is logarithmic, where a 10 dB increase represents a tenfold increase in sound intensity level relative to a fixed standard, usually 10⁻¹² W/m².