i know dat sound is a meagre source of energy & its conversion cant be useful for commercial purposes but still i want to know that 1 decibel is equal to how many joules or ergs or else how many decibels make a joule. i mean i jus wanna measure sound in joules ?????????????????????????????????????????????????????
2006-08-01 06:01:58 · 4 answers · asked by Alishan A 1 in Science & Mathematics ➔ Physics
A decibel is a relative measure; i.e. a ratio. A decibel SPL is a decibel relative a specific sound pressure or sound intensity. The ref. sound pressure is 2e-5 Pa. The ref. sound intensity is 1e-12 watts/m^2.
So you see, you cannot convert dB SPL to joules without specifying an area and a time period. Units, units, units!!!
2006-08-01 07:58:53 · answer #1 · answered by Tom H 4 · 0⤊ 0⤋
First define joules = 1watts/sec
dB can = almost anything depending on your reference.
0 dBm is 1 mili watt or .001 watts
0dBw is 1watt or 1 watt
loose your reference in time that joules have
2006-08-01 09:01:44 · answer #2 · answered by JOHNNIE B 7 · 0⤊ 0⤋
Do your own homework!! You were sent to summer school for a reason!!
Any chance you are going to summer school for spelling too?
2006-08-01 06:04:45 · answer #3 · answered by mytrollinid 5 · 0⤊ 0⤋
v+g/hk = j
2006-08-01 06:04:39 · answer #4 · answered by embigguns 5 · 0⤊ 0⤋