Sound intensity of whispering
**Core Concept**
The sound intensity of whispering is a measure of the loudness of a whisper in decibels (dB). This concept is related to the physical properties of sound waves and their perception by the human ear. The sound intensity of whispering is typically much lower than normal speech.
**Why the Correct Answer is Right**
The sound intensity of whispering is approximately 20 dB. This is because whispering produces a softer sound compared to normal speech, which is around 60 dB. Whispering occurs when the vocal cords vibrate more lightly, producing a lower amplitude sound wave. The human ear perceives this sound as softer due to the reduced energy of the sound wave. The sound intensity of whispering can be measured using a sound level meter.
**Why Each Wrong Option is Incorrect**
**Option A:** 40 dB - This is too low for whispering, which is typically around 20 dB.
**Option B:** 60 dB - This is the sound intensity of normal speech, not whispering.
**Option C:** 80 dB - This is the sound intensity of loud speech or shouting, not whispering.
**Clinical Pearl / High-Yield Fact**
The sound intensity of whispering is an important consideration in clinical settings, such as in patients with hearing impairments or in situations where sound levels need to be minimized to prevent damage to hearing.
**Correct Answer:** B. 60 dB