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# Feedback Comments on Wave Motion

by Ron Kurtus

A total of 91 comments and questions have been sent in. They are listed according to date.

## List of most recent 10 letters

### Country

Wave Motion How is going to the beach scientific? USA

Units of Frequencies and Wavelengths Error concerning high frequencies Sri Lanka

Doppler Effect Doppler Effect derivation India

Wave Motion Sound when car goes around the corner Romania

Speed of Light Ether and the MichelsonMorley experiment India

Wave Motion What is polarisation? Nigeria

Wave Motion Can I have every subtopic outlined? New Guinea

Wave Motion Mechanics of water waves Nepal

Waves and Obstacles Changes of frequency and wavelength India

Wave Motion Concerning wave motion and Doppler effect Nigeria

Next 10

## How is going to the beach scientific?

Topic: Wave Motion

### Question

August 30, 2015

Hello my teacher assigned me to do an essay on how going to the beach is scientific it's due tommorow is there any way u can describe every detail
Thank you love

Andrea - USA

26346

Going to the beach allows you to observe the way the waves come and and break on the beach. It also shows how the water can move the sand around. Another scientific area concerns the various life-forms in the water and on the beach.

The big thing is that you can be curious and make observations, which is what science is about.

## Error concerning high frequencies

Topic: Units of Frequencies and Wavelengths

### Question

March 1, 2015

Dear Ron Kurtus

I love your style of writing and easy to follow. I think you might have made a slip when you typed and missed the error. In the physics> Wave Motion > Units of Frequencies and Wavelengths

You have said in the second paragraph, last sentence:

"For example, at extremely high frequencies, you can have very long wavelengths and vice versa."

Since speed of wave is constant, and v = f?, frequencies and wave lengths are inversely proportional, so high frequencies should produce shorter wave lengths. I am sure it was a slip which did not catch your attention.

Thank you

Shrikharan

Shanmugalingam - Sri Lanka

25804

Thank you for pointing out that careless error. I meant to say that high frequency waves have short wavelengths.

## Doppler Effect derivation

Topic: Doppler Effect

### Question

August 18, 2014

you did not show the derivation for the third case.can you tell me what it is

GIRISH - India

25280

## Sound when car goes around the corner

Topic: Wave Motion

### Question

May 11, 2014

Hi! I have a question... Does centrifugal force affect sound waves? The exact situation would be in a moving car. If I'm sitting in the back and I want to talk to the driver, does the sound of my voice travel harder because of the force that makes objects and bodies press into the chair? I think it's called centrifugal force, but I'm not sure.. I know that wind does affect it. But the air in the car is static. Please help!

Levente - Romania

24949

When you are talking in a car moving in a straight line at a constant velocity, the air inside the car is moving at the same speed as the car, such that is seems to be stationary with respect to the people in the car.

However, when the car accelerates, the air moves and acts as if you were talking in the wind. The same thing happens when the car goes around a corner, although the air is moving sideways. This will result in a slight change of frequency of the sound, caused by the Doppler Effect.

## Ether and the MichelsonMorley experiment

Topic: Speed of Light

### Question

May 11, 2013

sir,my question is not about magnetic field it is about ether concept .when the velocity of light is finding out did the ether wind effect the velocity.if not ,
then we can conclude that ether was not their then why michelson -morley experiment done.

rajib - India

23677

The idea that space consists of a material called "ether" is appealing and helps to explain how light and magnetic fields travel.

One problem with the ether theory is that the substance would be fixed, such that the Earth would be moving through the ether, at a speed with respect to ether.

In the MichelsonMorley experiment, it was shown that the speed of light was the same in the direction of the motion of the Earth and a direction perpendicular to that motion. Thus the conclusion was that ether did not exist and some other mechanism was in play.

However, they did not take into consideration the motion of the Sun, our galaxy, and other motions that would affect the results.

There never has been a satisfactory explanation of what space is and how forces can act at a distance.

## What is polarisation?

Topic: Wave Motion

### Question

September 9, 2011

How can a wave be polarised?what does wave polarisation mean?

Samson - Nigeria

21967

While a water wave goes up and down while it travels, light waves vibrate in all directions perpendicular around a ray. If the light goes through a polarizing filter, only the waves vibrating in a certain direction pass through the filter. This is called polarized light.

See Light and Polarization for a good explanation.

## Can I have every subtopic outlined?

Topic: Wave Motion

### Question

June 8, 2011

Can I have every subtopic outlined and briefly explained to be mailed please?

Benjamin - New Guinea

21703

I'm sorry, but we do not email lessons. Feel free use our lessons to supplement your classwork.

## Mechanics of water waves

Topic: Wave Motion

### Question

May 28, 2011

sir, my question is on the mechanics of wave motion, i would like a complete description on the fact that how a wave travels in water when a stone is thrown and how is that a combination of both longitudinal and transverse wave? and obviously is a medium necessary for wave motion? because as far as i know light waves can even travel in vacuum. i hope to hear a positive response from you .

pratap - Nepal

21628

Water waves are caused by a circular motion of the water. On the surface, it looks like a transverse moving sine wave, but the circular motion gives it a longitudinal element. For a good description, see Water Waves.

Light waves are also transverse waves of a combination of electrical and magnetic waveforms. Electromagnetic waves do not require matter and travel through empty space.

## Changes of frequency and wavelength

Topic: Waves and Obstacles

### Question

March 29, 2011

What changes occur to the frequency and wave length of a wave when it undergoes a)refraction b)diffraction c)interference ?

21403

Refraction is the change in velocity and wavelength according to the index of refraction.

Diffraction and interference are the combining and cancelling of difference frequencies or wavelengths to form patterns. Only the amplitude changes.

## Concerning wave motion and Doppler effect

Topic: Wave Motion

### Question

March 16, 2011

please send something for me concerning wave equation, motion and Doppler effect.

- Nigeria

21335

See:

Doppler Effect for Waveforms

Doppler Effect Equations for Sound

Doppler Effect Equations for Light

Also look at the side listing of other topics.

Next 10

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