Intensity of sound sabaq | intensity level of sound | weber fechner law | 10th physics | urdu

intensity of sound sabaq or sound intensity lvel of sound or sound level of sound. Weber Fechner law. 10th class physics free online classes chapter no 11 10th class physics. queries solved in this video 1.what is Weber Fechner law ? 2. define weber fechner law ? 3. define sound intensity level 4. define sound intensity ? 5. define sound level 6. derivation of sound intensity level 7. what is sound intensity level sabaq 8. what is sound level sabaq 9. what is intensity level of sound sabaq 10. what is sound intensity ilm ki Most related searches 1. sound intensity level physics wallah topic 2. sound intensity level in urdu 3. sound intensity level in english 4. sound intensity level in hindi 5. sound intensity level physics 10th 6. sound intensity level 10th class physics chapter 11 sound 7. physics lectures class 10th chapter 11 sound Related searches 1. sound intensity level in urdu 2. sound intensity level in hindi 3. sound intensity level sabaq 4. sound intensity level khan 5. sound intensity level academy 6. sound intensity level haythem 7. sound intensity level ilm 8. sound intensity level physics wallah sabaq 9. sound intensity level foundation 10. sound intensity level 10th physics 11. sound intensity level 10th class physics 13. sound intensity level chapter 11 physics 10th 14. 10th class physics chapter 11 sound intensity level 15. 10th physics chapter 11 sound intensity level 16. sound level in hindi 17. sound level in urdu 18. sound level 10th physics 19. sound level khan 20. Sound Intensity Level The human ear responds to the intensities ranging from -12 -2 10 W m to more than 1 W m (which is loud enough to be -2 painful). Because the range is so wide, intensities are scaled by factors of ten. The barely audible and the faintest intensity -12 of sound i.e., 10 W m is taken as reference intensity, called -2 zero bel (a unit named after Alexander Graham Bell). The loudness of a sound depends not only on the intensity of sound but also on the physical conditions of the ear. The human ear is more sensitive to some frequencies rather than the others. The loudness (L) of a sound is directly proportional to the logarithm of intensity i.e., L log I L = K log I .......... (11.1) where K is a constant of proportionality. Let L be the loudness of the faintest audible sound of intensity o I and L be the loudness of an unknown sound of intensity , I o then by Eq. (11.1), we can write L = K log I .......... (11.2) o o Subtracting Eq. (11.2) fromEq.(11.1), we get L - Lo = K (log I I - log o ) = K log This difference,(L- L ), between the loudness L of an unknown o sound and the loudness L is called the intensity level of the o unknown sound. Therefore, the intensity level of an unknown sound is given by Intensity level = K log .......... (11.3) The value of K depends not only on the units of and but I Io also on the unit of intensity level. If intensity of any I unknown sound is 10 times greater than the intensity of Io the faintest audible sound i.e., =10 and the intensity level I Io of such a sound is taken as unit, called bel, the value of K becomes 1. Therefore, using K =1, Eq. (11.3) becomes Intensity level = log (bel) .......... (11.4) bel is a very large unit of intensity level of a sound. Generally, a smaller unit called decibel is used. Decibel is abbreviated as (dB). It must be remembered that 1 bel is equal to 10 dB. If the intensity level is measured in decibels, Eq. (11.4) becomes Intensity level = 10 log (dB) .......... (11.5) Using Eq. (11.5), we can construct a scale for measuring the intensity level of sound. Such scale is known as “decibel scale”. The intensity level of different sounds in decibe #intensityofsound #freevideolectures #freelectures #10thphysics #sabaq #soundlevel #intensitylevrlofsound