Hearing Is Expressed in Decibels (DB), or Units of Loudness

question 8

Multiple Choice

Hearing is expressed in decibels (dB) , or units of loudness. Which is the softest sound a normal ear can hear?

• A) 0 dB
• B) 10 dB
• C) 40 to 50 dB
• D) 100 dB

---

Definitions:

Calcium

A mineral essential for human life, involved in bone formation, muscle contraction, and many other physiological processes.

Phosphorus

A chemical element that plays a vital role in biological molecules like DNA and ATP.

Abundant Minerals

Naturally occurring inorganic substances found in plentiful supply on Earth, forming the foundation of rocks and soils.

Rotary International

An international service organization bringing together business and professional leaders to provide humanitarian service and advance goodwill and peace around the world.