Which unit is used to measure sound intensity level?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the Ontario Power Generation (OPG) Orange 1 Test. Ace your exam with multiple choice questions and detailed explanations. Prepare confidently!

Multiple Choice

Which unit is used to measure sound intensity level?

Explanation:
Sound intensity level is expressed in decibels because the ear’s perception of loudness is logarithmic and our everyday sound range is enormous. The decibel, denoted dB, is one tenth of a bel, which keeps numbers practical while reflecting how we perceive changes in intensity. The reference used is I0 = 1×10^-12 watts per square meter, and the level is given by L = 10 log10(I / I0). That means a tenfold increase in intensity raises the level by 10 dB, a hundredfold raises it by 20 dB, and so on. Hertz measures frequency, not intensity, and Newton measures force, so they don’t describe how loud something is. The bel exists but is impractical; decibels are the standard unit for this reason.

Sound intensity level is expressed in decibels because the ear’s perception of loudness is logarithmic and our everyday sound range is enormous. The decibel, denoted dB, is one tenth of a bel, which keeps numbers practical while reflecting how we perceive changes in intensity. The reference used is I0 = 1×10^-12 watts per square meter, and the level is given by L = 10 log10(I / I0). That means a tenfold increase in intensity raises the level by 10 dB, a hundredfold raises it by 20 dB, and so on. Hertz measures frequency, not intensity, and Newton measures force, so they don’t describe how loud something is. The bel exists but is impractical; decibels are the standard unit for this reason.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy