Table of Contents
What is 70 dB sound like?
70 decibels is as loud as a washing machine or a dishwasher. It is a moderate noise level. 70 dB noise is not considered harmful to human hearing. However, extended exposure to levels above 55-60 dB can be considered disturbing or become annoying.
What does 120 dB sound like?
Comparative Examples of Noise Levels
| Noise Source | Decibel Level |
|---|---|
| Thunderclap, chain saw. Oxygen torch (121 dB). | 120 |
| Steel mill, auto horn at 1 meter. Turbo-fan aircraft at takeoff power at 200 ft (118 dB). Riveting machine (110 dB); live rock music (108 – 114 dB). | 110 |
What frequencies are humans most sensitive to?
While 20 to 20,000Hz forms the absolute borders of the human hearing range, our hearing is most sensitive in the 2000 – 5000 Hz frequency range. As far as loudness is concerned, humans can typically hear starting at 0 dB.
What are the different levels of everyday noises?
10 dB: Normal breathing; 20 dB: Whispering from five feet away; 30 dB: Whispering nearby; 40 dB: Quiet library sounds; 50 dB: Refrigerator; 60 dB: Electric toothbrush; 70 dB: Washing machine; 80 dB: Alarm clock; 90 dB: Subway train; 100 dB: Factory machinery; 110 dB: Car horn; 120 dB: Ambulance siren
What is the range of audible sound in air?
By how much must the temperature of the air near 0^oC be changed to cause the speed in it to change by 1 \\%. The range of audible frequencies is from about 20 Hz to 20000 Hz. What is range of the wavelengths of audible sound in air?
How many miles per hour does sound travel?
Sound travels about 750 miles per hour. If you stand in a canyon and sound a horn, you will hear an echo. Suppose it takes about 4 seconds to hear the echo. How far away is the canyon wall, in feet? A 37.5-cm-long metal pipe is closed at one end. A small loudspeakeris placed near the open end. The speed of sound in the pipe is 333 m/s.
Which is the smallest sound on the decibel scale?
The decibel scale is logarithmic, meaning it increases by the power of 10 each time. The smallest audible sound is 0 dB. A sound that is 10 times more powerful is 10dB, a sound that is 1,000 times more powerful is 30 dB, and so on (it helps to count the zeroes in the scale to keep track!)