Amplitude Definition and 868 Threads

The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). There are various definitions of amplitude (see below), which are all functions of the magnitude of the differences between the variable's extreme values. In older texts, the phase of a period function is sometimes called the amplitude.

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  1. H

    Wave Amplitude and Knot Movement

    A 4.0 Hz wave with an amplitude of 12 cm and a wavelength of 30.0 cm travels along a stretched string. (a) How far does the wave travel in a time interval of 3.0 s? m (b) How far does a knot on the string travel in the same time interval? m I got the answer to part (a) by using...
  2. N

    Calculating Amplitude of Brick Separation from Piston with SHM

    A brick is resting atop a piston that is moving vertically with simple harmonic motion of period 1.08 s. At what amplitude will the brick separate from the piston? I came across this question reviewing for my test next Thursday. Anyway, I can calculate the angular frequency using the...
  3. G

    Determining total amplitude of out of phase waves

    I understand there is a way to solve the problem with complex numbers, but am at a loss as to how: Determine the amplitude of the resultant motion when two sinusoidal motions having the same frequency and traveling in the same direction are combined, if their amplitudes are 3 cm and 4 cm and...
  4. F

    Finding Amplitude of Air Vibration from Frequency and Intensity

    I'm given two things: frequency, f = 313 Hz intensity, I = 1.13 uW/m^2 (microWatts per square meter) I'm supposed to find the amplitude of the air vibrations caused by this sound. As always, a push in the right direction is greatly appreciated.
  5. W

    Simple harmonic motion and amplitude of an object

    I have a short question: an object undergoes simple harmonic motion with a period T and amplitude A. How long does it take the object to travel from x = A to x = A/2 ? the answer is T/6, but I am not sure how to get to that, Do I get it from x = Acos(2pi/T xt)? help :cry:
  6. P

    What's the meaning of amplitude in EM wave?

    i learned that EM wave is varying electric field and magnetic field .But what's the meaning of the amplitude of EM wave? The displacement of the photon or the magnitude of the electric/magnetic field(no. of photons)?
  7. infraray

    What is Frictional Amplitude in Laser Cutting?

    A phrase was used the other day that gave me rise to question, and that is frictional amplitude. Has anyone ever heard this phrase in the context of lasers especially cutting. Not knowing enough about lasers just yet I can neither confirm nor deny the validity of the phrase. I have done...
  8. J

    Find the amplitude and period of the function

    A weight hanging on a vertical spring is set in motion with a downward velocity of 6 cm/sec from its equilibrium position. Assume that the constant w for this particular spring and weight combination is 2. Write the formula that gives the location of the weight in centimeters as a function of...
  9. J

    What Is the Difference Between Amplitude and Magnitude in Quantum Mechanics?

    Amplitude ?? Magnitude ?? Dear all, would you tell me what is the difference of Amplitude and Magnitude ?? thanks
  10. wolram

    Gravitational Radiation Amplitude: Inverse Square Law Explained

    gravitational radiation is now widely accepted, and the mathematical outcome of an events radiation is calculable, but why is the inverse square law applicable to the amplitude of this radiation?
  11. E

    How to i solve the amplitude 3sin(2x)+4sin(x)

    how to i solve the amplitude 3sin(2x)+4sin(x)
  12. M

    Maximum amplitude of oscillation of a block

    I've been staring at this problem for a loonnng time and i just can't figure it out:(.. i would appreciate it if someone could help me...thx! :) A large block with mass 26 kg executes horizontal simple harmonic motion as it slides across a frictionless surface with a frequency 1:9 Hz ...
  13. M

    Amplitude and phase of a Feynman path

    Can the amplitude and phase associated with each of the paths in the Feynman path integral be connected to geometric attributes of that path? For example, is the amplitude and phase connected to how long the path is or how much it curves or how much it deviates from the geodesic?
  14. B

    What does the A stand for in this equation?

    What does the A stand for in the equation: y=A\sin{(kx-t\omega)} CHEERS :)
  15. P

    Amplitude and Intensity Relationship: Explained and Solved

    Stupid Amplitude...HELP! So I am working on some phys homework and I had a question about this problem: If the Amplitude of a sound wave is quadrupled, by what factor will the intensity increase? And I thuoght that the relationship between Intensity and amplitude was that Intensity is...
  16. barcat

    Amplitude and Velocity Relationship in Violin Playing

    I have already posted (at school) my answer to this one, but the more I think about it, the more I'm confused. The question is "When playing a violin, the effect produced when the bow is drawn faster across the string is; a. A higher pitch. b. greater wave velocity in the string. c. a...
  17. Y

    Intensity and Relative Amplitude

    How would you calculate the intensity using relative amplitude. Say for a violin...how would you calculate it's intensity for one of it's harmonics or overtones.
  18. anil

    Frequency-Amplitude: Do Higher Frequencies Mean Higher Amplitude?

    Do higher frquencies have higher amplitude? Bats communicate at Ultasonic frequencies. DOes this mean the waves amplitude is very high?
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