Education
- Laplace's Correction To Newton's Formula
Assuming isothermal conditions to prevail when sound travels through air, Newton has applied Boyle's law to the changes in pressure and volume. In a region of compression, there is a slight increase in temperature and in a region of rarefaction, there...
- Velocity Of Light By Foucault’s Method
Foucault's Method of Determination of Velocity Of Light:- The schematic diagram of Foucault’s method to determine the velocity of light is as shown in figure. It consist of three mirror, such as plane & concave mirror, partially silvered and...
- Physics Engineering Syllabus By Ioe
Physics Syllabus For Engineering Entrance Examination In Nepal Given by Institute Of Engineering IOE :Unit I. Mechanics:DimensionsEquations of motion, Motion of a projectile. Laws of motion.Addition and subtraction of vectors. Relative velocity. Equilibrium...
- Doppler's Effects On Sound
Doppler's effects The apparent change in frequency of wave due to the relative motion between source and observer is called Doppler's effect.When source and observer move,there is change in velocity of wave.And when source moves towards observer,there...
- Entrance Exam Questions Of Class 11 (physics )
Question Option1 Option2 Option3 Option4 Answer Total internal reflection can occur when lights passes from: a denser to rarer medium a rarer to denser medium one medium to another of equal refractive index medium to another of equal absorption...
Education
Newton's Formula for Velocity of Sound
Velocity Of sound in depends on the two factors:-
We get:-
where c is velocity of sound ,E is modulus of elasticity of the medium and p is density of medium.
Hence finally we come on the result that velocity of sound in air is given by
- Modulus of elasticity
- Density of medium.
We get:-
Newton's expression
Newton assumed the propagation of sound wave in air as isothermal process.So he used isothermal equation of state. i.e.pv=constant
by differentiating both side,we get
-dP/(dv/v)=P
where dP is change in pressure
dv is change in volume
v is volume
P is pressure
since -dP/(dv/v) is numerically equal to modulus of elasticity.i.e bulk modulus of elasticity B for air.
Hence finally we come on the result that velocity of sound in air is given by
From this formula ,if we put the values of B and p,we get the value of velocity of sound nearly equal to 280m/s which is very smaller value than the actual value.So there must be some wrong in the formula.So Laplace corrected this formula and gave the name Laplace Correction.
See here Laplace Correction :
- Laplace's Correction To Newton's Formula
Assuming isothermal conditions to prevail when sound travels through air, Newton has applied Boyle's law to the changes in pressure and volume. In a region of compression, there is a slight increase in temperature and in a region of rarefaction, there...
- Velocity Of Light By Foucault’s Method
Foucault's Method of Determination of Velocity Of Light:- The schematic diagram of Foucault’s method to determine the velocity of light is as shown in figure. It consist of three mirror, such as plane & concave mirror, partially silvered and...
- Physics Engineering Syllabus By Ioe
Physics Syllabus For Engineering Entrance Examination In Nepal Given by Institute Of Engineering IOE :Unit I. Mechanics:DimensionsEquations of motion, Motion of a projectile. Laws of motion.Addition and subtraction of vectors. Relative velocity. Equilibrium...
- Doppler's Effects On Sound
Doppler's effects The apparent change in frequency of wave due to the relative motion between source and observer is called Doppler's effect.When source and observer move,there is change in velocity of wave.And when source moves towards observer,there...
- Entrance Exam Questions Of Class 11 (physics )
Question Option1 Option2 Option3 Option4 Answer Total internal reflection can occur when lights passes from: a denser to rarer medium a rarer to denser medium one medium to another of equal refractive index medium to another of equal absorption...