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

Homework help, Describe an actual situation that would give rise to the fre...

Describe an actual situation that would give rise to the free body diagram

What is the cause of brownian motion, What is the cause of Brownian motion?...

What is the cause of Brownian motion? Molecules in a gas move constantly, freely, randomly, in all directions and at high speeds. They are able to do so because the intermolecu

Explain the kinetic theory, Explain the Kinetic Theory Kinetic theory l...

Explain the Kinetic Theory Kinetic theory looks at how each of these steps adds more internal kinetic energy (jiggle energy) to the material. A solid is a framework of atoms an

How much percent conductivity of copper is less than silver, The conductivi...

The conductivity of copper is less than that of silver by (A) 5 - 10 %. (B) 50 - 60 %. (C) 80 - 90 %. (D) 20 - 30 %. Ans: The conductivity of copper

Electromagnetism, A charge of 111 pC is uniformly distributed throughout th...

A charge of 111 pC is uniformly distributed throughout the volume of an isolated sphere of diameter 40 cm. Calculate the electric field at the following distances from the centre o

Draw a force diagram, The magnitude of a charge, q, is to be determined by ...

The magnitude of a charge, q, is to be determined by transferring the charge equally to two pith balls. Each of the pith balls has a mass of m, and is suspended by an insulating th

Explain current and voltage relationship for two resistors, The current/vol...

The current/voltage relationship for two resistors A and B is as shown in Figure. Verify the value of the resistance of every resistor.

The electric field strength is zero, a)  A positive point test charge q 0  ...

a)  A positive point test charge q 0  is placed at the midpoint p among the two equal positive charges q. What forces acts on it at or near this point p?   b)  Two charges 1X10 -

What is a temperature scales, What is a Temperature Scales? Fahrenheit,...

What is a Temperature Scales? Fahrenheit, Celsius and Kelvin were scientists who studied how heat and temperature work. The most familiar scale to Americans (until the time tha

Determine the primary current and power factor, A single-phase transformer ...

A single-phase transformer has 2000 turns on the primary and 800 turns on the secondary. Its no-load current is 5A at a power factor of 0.20 lagging. Assuming the volt drop

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