Wave: amplitude, frequency, wavelength

  • Thread starter ahchew1413
  • Start date
  • #1

Homework Statement


Original question: A boy flicked a string harder, describe the changes of the waveform and the speed of the wave.


Homework Equations


V = f x λ
Frequency is how many completed oscillation per second.
Wavelength is distance between two adjacent points of the same phase on a wave.


The Attempt at a Solution


My answer: Amplitude will increase, and speed remain unchanged. Flicked harder, more energy received, amplitude bigger. Speed depend on medium, so unchanged.

My confusion:
1. The displacement of pendulum is amplitude, how to find wavelength from there?
Let said From A to B to C to B to A. Is the wavelength is the distance move by the pendulum along the path?


2. If the amplitude turn bigger but the speed remain, it should take more time to go up and down, so wavelength become shorter?

3. By assume statement 2 is correct, according to the formula, frequency should be higher. Am I right


Very confused.
ahchew1413
 

Answers and Replies

  • #3
I still can't understand how to find wavelength from the pendulum. Can you kindly explain a bit.

thanks,
ahchew
 
  • #4
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
2020 Award
35,148
6,278
More information needed. Is this string as a pendulum, and the boy makes the pendulum swing wider? Or is this a travelling transverse wave being sent down a string by a flick? Or is it a stretched string with a standing transverse wave?
 
  • #5
hi haruspex:

The original question regarding the wave:
It is a travelling transverse wave being sent down a string by a flick. The boy create a transverse wave the a rope, then, he flicked harder to see the changes.

Why the flick does not change the frequency and wavelength? Was it because the medium (the rope) does not change, as a result, speed does not change. So, frequency and wavelength does not change also?



Other question that not related to original question.
How do we find the wavelength from a pendulum?

thanks,
ahchew
 

Related Threads on Wave: amplitude, frequency, wavelength

Replies
1
Views
7K
Replies
10
Views
3K
  • Last Post
Replies
20
Views
12K
Replies
1
Views
19K
Replies
4
Views
1K
Replies
2
Views
28K
  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
4
Views
3K
Top