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

Force, conditions of equilibrium for concurrent force system

conditions of equilibrium for concurrent force system

SURFACE TENSION, WHY Surface tension increases when an highly soluble SUBST...

WHY Surface tension increases when an highly soluble SUBSTANCE is dissolved in water WHILE IT DECREASES WHEN an weakly soluble substance is dissolved in water

Define tangent galvanometer, It is an instrument which can detect/calculate...

It is an instrument which can detect/calculate very small electric currents. It is also called as moving magnet galvanometer. It has of three circular coils of insulated copper wir

Classifications of capacitors, The capacitors can be classified on the basi...

The capacitors can be classified on the basis of nature of value, type of dielectric material used and polarity. On the basis of nature of value: Fixed value capacitor

Main features of simple harmonic motion, 1. Particle travels in straight li...

1. Particle travels in straight line and the motion is periodic 2. The acceleration of particle is always proportional to the displacement from the equilibrium position and alwa

Determine the maximum height the pinball rolls, Let's say I have a pinball ...

Let's say I have a pinball (solid sphere) with a given mass and radius, and it is held back at a certain distance from equilibrium on a spring. The spring constant k is given, and

Sketch a motion diagram, You may find parts of this question similar to the...

You may find parts of this question similar to the \Landing on an Alien World" activity that we did some time ago in class. Start by opening the \Maze Game" activity. You can find

Explain electroplating, It is a method of depositing a thin layer of one me...

It is a method of depositing a thin layer of one metal over one more metal by the method of electrolysis. The articles of cheap solids are coated with valuable metals like silver a

Define teacup engine, Define Teacup Engine? The astronaut was calmly dr...

Define Teacup Engine? The astronaut was calmly drinking tea at five o'clock galactic time, as was his wont, when he had an urgent situation outside the shuttle and he had to do

What is the velocity of the needle, A record player's needle is 6.5 cm from...

A record player's needle is 6.5 cm from the center of a 45-rpm record. Calculate velocity of the needle?

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