Mindblown: a blog about philosophy.
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How do sound levels add ?
If there are two sound sources in a room – for example a radioproducing an average sound level of 62.0 dB, and a television producinga sound level of 73.0 dB – then the total sound level is a logarithmicsum ie Combined sound level = 10 x lg ( 10^(62/10) + 10^(73/10) ) = 73.3 dB…
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What does dB(A) or “A-weighted” mean ?
Noise was not of particular concern at the beginning of the century.The first electrical sound meter was reported by George W Pierce inProceedings of the American Academy of Arts and Sciences, v 43 (1907-8)A couple of decades later the switch from horse-drawn vehicles toautomobiles in cities led to large changes in the background noiseclimate. The…
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How is sound measured ?
A sound level meter is the principal instrument for general noisemeasurement. The indication on a sound level meter (aside fromweighting considerations) indicates the sound pressure, p, as a levelreferenced to 0.00002 Pa. Sound Pressure Level = 20 x lg (p/0.00002) dB Peak levels are occasionally quoted. During any given time intervalpeak levels will be numerically…
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What is a decibel (dB) ?
The decibel is a logarithmic unit which is used in a number ofscientific disciplines. In all cases it is used to compare somequantity with some reference value. Usually the reference value is thesmallest likely value of the quantity. Sometimes it can be anapproximate average value. In acoustics the decibel is most often used to compare…
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What makes sound?
Sound is produced when the air is disturbed in some way, for exampleby a vibrating object. A speaker cone from a hi-fi system serves as agood illustration. It may be possible to see the movement of a bassspeaker cone, providing it is producing very low frequency sound. Asthe cone moves forward the air immediately in…
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What is sound ?
Sound is the quickly varying pressure wave within a medium.We usually mean audible sound, which is the sensation (as detected bythe ear) of very small rapid changes in the air pressure above andbelow a static value. This “static” value is atmospheric pressure(about 100,000 Pascals) which does nevertheless vary slowly, as shownon a barometer. Associated with…
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What can I do after Automotive Engineering?
Ans. It is an extensive field; you can get numerous job opportunities after graduation. You can either work in automotive industries and manufacturing companies or become a professor in engineering colleges. Thus, this field opens the door to various job opportunities. Some of the job profiles after Automotive Engineering:
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How can I become an Automotive Engineer after the 12th?
Ans. You must fulfil the basic requirements to become an automotive engineer. Firstly, the candidate must have passed class 12th with PCM stream with a minimum of 50% marks. Then, you need to appear in the entrance exam for engineering to get admission to top colleges in India. Furthermore, you need to get admission to…
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Make a Career in Automobile Engineering
With the rise in the demand for quality automobiles among people, the need for skilled, creative and knowledgeable automobile engineers is also increasing. Choosing automobile engineering would be a great choice without any doubt. Furthermore, you get various choices of job titles that you can choose as per your interest and skills. Some of the…
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Marketing Engineer
Marketing engineers are professionals who have knowledge of both, the automobile and marketing. They use their knowledge to market the mechanical products of the company in front of people to increase sales. Job Description As a marketing engineer, your task will be to collect data on customer reviews related to products. Make strategies to promote…
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