Question

The range of sound level of a jet aircraft at take-off stage is around

• A. 80--90 dB
• B. 90--100 dB
• C. 100--110 dB
• D. 70--80 dB

Hint:

Typical sound levels: \[ \boxed{ \begin{aligned} \text{Normal conversation} &\approx 60\ \text{dB}\\ \text{Busy traffic} &\approx 80\text{--}90\ \text{dB}\\ \text{Jet aircraft (take-off)} &\approx 100\text{--}110\ \text{dB} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Set up a rough noise scale.
Normal conversation sits around 60 dB, busy road traffic around 80 to 85 dB, and a loud power tool or nearby thunder around 90 to 100 dB.
Step 2: Place a jet aircraft take-off on this scale.
A jet engine at full thrust during take-off produces some of the loudest sustained sound in daily engineering experience, well above heavy traffic or industrial machinery.
Step 3: Pick the matching range.
This puts it in the range of about 100 to 110 dB, higher than any of the other listed ranges.
\[ \boxed{100\text{-}110\ \text{dB}} \]