Skip to main content

Doppler Effect


  • Doppler Effect states that there is a change in the frequency of sound because of the relative motion between the observer or the listener and the source of the object.
  • In simpler words when the source and the listener are in a relative motion there is a change in the frequency of sound and this effect of a change in frequency is known as the Doppler's Effect of sound.


  • When the objects move apart the frequency decreases.
  • When the objects move towards each other the frequency increases.
  • The change in the frequency of the sound is given by the formula:



n = n' (V±Vo / V±Vs)

Where, n = actual frequency of sound
             n' = Apparent Frequency
             v = Speed of sound
             Vo = Spped of the observer
             Vs = Speed of the source



Conditions


1. When the observer is at rest i.e. Vo = 0
     In this case, the formula becomes:

     n = n' (V / V±Vs)
     a) If the source is moving away from the observer then Vs will be positive as n decreases with increase in Distance.
     b)If the source is coming towards the observer then Vs will be negative.



2.When the source is at rest i.e. Vs = 0
     In this case, the formula becomes:

     n = n' (V±Vo / V)
     a)If the observer is moving away from the source then Vo will be negative.
     b)If the source is coming towards the observer then Vo will be positive.



3.Both are moving
   In this case, the formula becomes:

   n = n' (V±Vo / V±Vs)
   a)If both are moving away then Vo will be negative and Vs will be positive.
   b)If both are moving closer then Vo will be positive and Vs will be negative.
 



Enjoy your high school with - High School Pedia : www.highschoolpedia.com

   

Comments

Popular Posts

Top 5 Best PC Games

Hi, this is highschoolpedia, and today we are going to show you our list of top 5 PC games that you must play. So let's get started... 1) FIFA 17 FIFA 17 is the latest  football video game in the FIFA series. It released on 27 September 2016 in North America and globally. FIFA 17 will be the first FIFA game in the series to use the Frostbite game engine. It is the first FIFA game to have a story mode. It is available in 2 versions.

Top 5 Upcoming Cars In 2017

Hi guys!!!!! So in this post, we will talk about the upcoming cars of 2017... New Maruti Swift The new gen Swift will also debut in our market next year. This car will be bigger in size and available with a powerful set of engines. The Swift Sport with the 1.6L engine could also be on offer keeping the changing trend of the market in India.

Animal and Plant Cells

 Cells Cells are the basic functional, biological and structural unit of life. The word cell is a Latin word meaning ‘small room’. Cells are also known as building blocks of life.  The branch of science that deals with the form, structure, and composition of a cell is known as Cytology. All organisms around us are made up of cells. Bacteria, ameba, paramecium, algae, fungi, plants and animals are made up of cells.  Cells together form tissues. And tissue together makes an organ. History Of Cell The cell was discovered by Robert Hooke in 1665. He assembled a simple microscope and observed a very thin slice of cork under his primitive microscope. The cork was obtained from the outer covering of a tree called bark. Robert Hooke observed many little-partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-comb. He termed these boxes as the cell. He also noticed that one box was separated from another by a wall. What Ho

Rutherford Alpha Ray Scattering Experiment

Rutherford Alpha Ray Scattering Experiment Hey, Guys, most of you might have heard about the alpha ray scattering experiment and if you want to know in detail about Rutherford's model and the experiment he conducted, this is the right place for you... But first: Things You Must Know Some basic information that will help you understand rutherford experiment properly: Proton is a sub-atomic particle which is positively charged and has a mass of 1u. Alpha particles are helium atom with a charge of +2 as they have lost 2 electrons. Alpha particles have an atomic mass  of 4u. Gold is highly malleable and can be beaten into very thin sheets. Experiment Rutherford conducted his experiment in the following way: Rutherford took a very thin gold foil and bombarded it with high energy alpha particles. He placed a layer of zinc sulphide on the walls where the experiment was taking place because when alpha particles strike zinc sulphide layer, it results i

Isotopes, Isobars and Isotones

Isotopes These are elements which have the same atomic number but different atomic mass . They have the same atomic number because the number of protons that are inside their nuclei remains the same. But, they have different atomic mass because the number of neutrons that are also inside their nuclei is different. As the number of protons inside nuclei remains same, therefore the overall charge of the elements also remains same as in isotopes: no of protons = no of electrons . Hence, as isotopes overall charge remains neutral, therefore their chemical properties will also remain identical.   Therefore, Isotopes are chemically same but physically different.

Cathode Ray Experiment

This experiment was conducted by J.J. Thomson (Sir Joseph John Thomson) in the year 1897. This experiment proved that atom is made up of fundamental particles which are much smaller than the smallest atom 'hydrogen' This experiment helped to discover electron. According to J.J. Thomson, the cathode rays consisted of very light, small and negatively charged particles. He named the particles "corpuscles" which were later known as electrons

Top 5 Highest Paid Actors in The World

Wanna know who are the top 5 highest paid actors in the world? You have come to the right place !! 1) LEONARDO DICAPRIO  ( $77 MILLION / MOVIE)