Speed of standing wave


by Spirochete
Tags: speed, standing, wave
Spirochete
Spirochete is offline
#1
Feb2-09, 07:02 PM
P: 127
1. The problem statement, all variables and given/known data

The standing wave in the picture is oscillating at 100 Hz. What is it's velocity?


2. Relevant equations

Velocity=(wavelength)(frequency)

I believe is the equation that applies here.


3. The attempt at a solution

The wavelength from the picture appears to be 20x10-2 meters.

So velocity should equal (20x10-2)(100)= 20 meters per second

But I know this answer is wrong. Where am I going wrong?
Attached Thumbnails
standing wave.jpg  
Phys.Org News Partner Science news on Phys.org
SensaBubble: It's a bubble, but not as we know it (w/ video)
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Microbes provide insights into evolution of human language
berkeman
berkeman is online now
#2
Feb2-09, 07:29 PM
Mentor
berkeman's Avatar
P: 39,720
Quote Quote by Spirochete View Post
1. The problem statement, all variables and given/known data

The standing wave in the picture is oscillating at 100 Hz. What is it's velocity?


2. Relevant equations

Velocity=(wavelength)(frequency)

I believe is the equation that applies here.


3. The attempt at a solution

The wavelength from the picture appears to be 20x10-2 meters.

So velocity should equal (20x10-2)(100)= 20 meters per second

But I know this answer is wrong. Where am I going wrong?
Why do you say that the wavelength is 20cm? Draw a full cycle of a sine wave -- what does it look like?

Also, be careful with your units. It looks like you are mixing cm and meters in your multiplication and answer....?


Register to reply

Related Discussions
Electromagnetic wave reflects off a surface at a 90 degree angle. Standing wave? Introductory Physics Homework 2
Standing Wave? Introductory Physics Homework 2
standing wave Introductory Physics Homework 22
standing wave General Physics 2
Wavelength, frequency, and speed of a Standing wave. Introductory Physics Homework 4