Derivation of y(x,t)=Asin(kx-wt)

  • Thread starter Thread starter morrobay
  • Start date Start date
  • Tags Tags
    Derivation
Click For Summary
SUMMARY

The equation y(x,t) = A sin(kx - wt) represents a solution to the wave equation, where A is the amplitude, k is the wave number, and w is the angular frequency. For a fixed value of y, the term (kx - wt) remains constant, indicating a specific phase of the wave. The complete solution is a superposition of multiple wave functions, expressed as A sin(kx - wt + C), where C represents a phase shift. The relationship between w and k defines the wave's propagation speed.

PREREQUISITES
  • Understanding of wave equations in physics
  • Familiarity with trigonometric functions, specifically sine
  • Knowledge of wave parameters: amplitude (A), wave number (k), and angular frequency (w)
  • Basic grasp of superposition principle in wave mechanics
NEXT STEPS
  • Study the derivation of the wave equation in classical mechanics
  • Learn about the superposition principle in wave theory
  • Explore the relationship between wave speed, frequency, and wavelength
  • Investigate graphical representations of wave functions
USEFUL FOR

Students of physics, educators teaching wave mechanics, and anyone interested in understanding wave behavior and solutions to wave equations.

morrobay
Gold Member
Messages
1,145
Reaction score
1,813
Can someone show, or explain with a diagram, how y(x,t)=Asin(kx-wt)
is a solution of the wave equation. In particular how for a given (y) value that
(kx-wt) is a constant.
 
Physics news on Phys.org
This isn't the full solution. The full solution is a superposition of solutions
Asin(kx - wt + C), with different A's, k's, w's and C's, subject only to w/k=
(propagation speed of wave)

morrobay said:
In particular how for a given (y) value that
(kx-wt) is a constant.

I don't understand this at all. y depends on x and t, and so does (kx-wt)
 
morrobay said:
Can someone show, or explain with a diagram, how y(x,t)=Asin(kx-wt)
is a solution of the wave equation. In particular how for a given (y) value that
(kx-wt) is a constant.

If y and A are constant, so is arcsine(y/A). That should get you going.
 

Similar threads

  • · Replies 16 ·
Replies
16
Views
7K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 10 ·
Replies
10
Views
8K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
12
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K