Calculate the actual intensity, Physics

Assignment Help:

The threshold of hearing is 10-12 watts/m2 or 0 dB.  How many times more intense than the threshold of hearing is 70dB and what is the actual intensity (in watts/m2) at the 70 dB level?  Show the physics.

Solution:

The threshold of hearing is assigned a sound level of 0 decibels (abbreviated 0 dB); this sound corresponds to an intensity of 1*10-12 W/m2.

A sound that is 10 times more intense ( 1*10-11 W/m2) is assigned a sound level of 10 dB. A sound that is 10*10 or 100 times more intense (1*10-10 W/m2) is assigned a sound level of 20 db. A sound that is 10*10*10 or 1000 times more intense (1*10-9 W/m2) is assigned a sound level of 30 db. A sound that is 10*10*10*10 or 10000 times more intense (1*10-8 W/m2) is assigned a sound level of 40 db.

Hence a sound that is 10 ^ 7  (10 to the power of 7) or 10000000 times more intense (1*10-5 W/m2) is assigned a sound level of 70 db.

 


Related Discussions:- Calculate the actual intensity

Physics Matlab Report, Hello, I have some computing physics coursework in...

Hello, I have some computing physics coursework involving Matlab. I would like to know if your organisation can get this coursework done for me. I am ready to upload the assignme

Compute the resistance of the filament, Q. Compute the resistance of the fi...

Q. Compute the resistance of the filament of a 100W, 220 V electric bulbs. Power P = V 2 /R Resistance R = V 2 /P = (220 X 220)/ 100 = 484 ohm.

Fresenl''s theory, explain fresenl''of optical rotations theory

explain fresenl''of optical rotations theory

Introduce concept about the carbon dioxide laser, Introduce concept about t...

Introduce concept about the carbon dioxide laser. A test target is vaporized and bursts within flame onto irradiation through a high power continuous wave carbon dioxide laser

Capacitors in series, Capacitors in series: When three capacitors are c...

Capacitors in series: When three capacitors are connected in series.  If one electron moves from the negative terminal of the cell to the right hand plate of C 3 , and one elec

Differentiate between displacement and conduction current, Differentiate be...

Differentiate between displacement current and conduction current.

Kinetic energy and potential energy, Assumptions: Kinetic Energy=KE, Potent...

Assumptions: Kinetic Energy=KE, Potential Energy=PE m=mass of the skateboarder=55 kg, Velocity v=1.80m/s So ,Initial Energy(KE) of the skateboarder=mv 2 /2 = 0.5* 55 * (1.8)^

Define ampere in terms of force, Q. Define: ampere in terms of force A...

Q. Define: ampere in terms of force Ampere is defined as that steady current which when flowing through two parallel infinitely long straight conductors of negligible cross se

Refractive astronomical telescope, Refractive Astronomical Telescope: I...

Refractive Astronomical Telescope: It is an optical instrument which is used to see heavenly bodies such as stars, moon and planets is known as telescope. Astronomical teles

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd