Design a site like this with WordPress.com

# Do You Have a Science Question for our Community?

Do You Have a Science Question for our Community?

One of our members Miz Abynaah wanted to know more about the Doppler Effect (http://goo.gl/KIOa6B). Mike Aben  wrote this terrific explanation below as well as sharing this great video by +Alt Shift X.

Mike Aben: The Doppler Effect

The Doppler effect occurs whenever an object emitting waves is moving.  The effect is observed with any waves (water, sound, light, etc).  The waves being emitted ahead of the object’s motion are compressed, which means they will reach an observer at a higher frequency than if the object was stationary.  The waves emitted behind the object are stretched out and will reach an observer at a lower frequency.

With sound waves, this affects the pitch of the sound heard.  For example, the sound of a car traveling towards you will be at a higher pitch than the sound of a car moving away from you.  With visible light, it is the colour of the light that is affected.  Lower frequency light is redder, while higher frequency light is bluer.  For the effect to be noticeable with light, the relative velocity of the object to the observer has to be very high.

**

This post was chosen by Zuleyka Zevallos  for #SoG+CuratorsChoice  #physics   #science

## Join the Conversation

1. nice but explain it for a centrifugal movement, I like your Science a lot I love it , send you to Ion Murgu postulate in Physics and to begin a discus there, first postulate is for heavy, but begin with second, we can

Like

2. My question is could you explain the reason in testical to body size in the animal kingdom.

Like

3. The capability of your IQ

Like

4. Super 🙂

Like

5. I would suggest an edit – it is either the I object moving or the “listener” moving. It doesn’t matter which. It’s all relative! Think train moving and viewing platform next to train. Relativity.

Like

6. Because the stars are moving away from Earth, that implies an important piece of evidence for the big bang? I say you are stretching the fact there!

Like

7. i think by pass this qustion and move to tellaport

Like

Like

9. one more question for the community how to extract keratin from hair

Like

10. Gracias, muy claro.

Like

11. Pretty cool

Like

12. What is Pretty cool

Like

13. Having been a student of physics, some time ago, I knew about the doppler effect, but I enjoyed your explanation very much. Thanks.

Like

14. Recently learned how it affects sound waves, mind blown thinking that it can affect light too. Sadly light travels so fast, it must be impossible getting a light source to move fast enough to notice a color difference by eye.

Like

15. DeAija Anderson

Like

16. Are microwaves contributing to a rise in cancer? I know of one Dr who says technology from cell phones affects us

more than we think.﻿

Like

17. Someone please explain to me again…why a wave function collapses in an experiment while it (the experiment) is being observed

Like

18. atleast learnt something

Like

19. Cool stuff

Like

20. Dan Corby Because that’s what the Copenhagen Interpretation says it does. Well, not quite, but a wave-function is a complex function – and continuous.

There is no justification for this continuously-valued function to have any specific value. But we only see specific values when we look at, say, the energy of an electron. So the term ‘collapse’ is used to go from the can-be-any-damned-thing to the specific value of such-and-such eV.

It’s a poor choice of words – nothing ‘collapses’ no more so than a box of paperclips, when reached into, results in a paperclip being present at a certain place. Although, to complicate matters, the paperclips have ‘internal hidden variables’ (like position) that the quantum entities do not have.

(phew!)

Like

21. I never knew that

Like

22. I liked the video

Like

23. Gud question

Like

24. not much interested in science

but still i like it

Like

25. What are the causes water pollution

Like

26. That was interesting. Cool way to learn about it😄

Like

27. What are the causes of water pollution

Like

28. How is light speed calculated? and how do astrophysicists know tht a certain light source took xyz years for make tht place visible to us?

Like

29. i hav so much intrest in physics. how intresting this is. gret things r there

Like

30. Michael Conley

Like

Like

32. I am so sorry for people thinking this is an explanation. There is NO explanation WHY here. Please edit your. Add the most important information about types of velocities(phase….),types of waves(transverse vs longitudal) and if you mention light explain why the frequency changes with the C constant for each observer because many people asociate doppler with c instead of the speed of the phase.

Like

33. Jess Jensen

Like

34. The apparent change in the frequency of sound when a listner moves towards the source or the source moves towards the listner or both moves towatds or away from each other is called doppler effect.

Like

35. cathy vaughan are you on drugs

Like

36. Rob Kook my god your einstien reborn

Like

37. chandra jibi

Like

38. priya yadav ..great of mind

Like

39. The sun of light

Like

40. How day and night occurs

Like

41. Chashmeshahi

Like

42. Well explained. It is very clear. Thank you

Like

43. Interesting. What does it look like if another object interrupts the waves between the object & you? Isn’t that how sonar works?

Like

44. umesh amin

Like

45. very good

Like

46. Michael Copenhaver i have seen a doco with just such as u query, it was in respect of perception and belief formation in the mind, they used water as a ripple effect – its all very interesting stuff.

Like