Formula for calculating the frequency


We also have the frequency of the listener so this formula all of this formula is actually equal to the frequency of the listener okay so ladies and gentlemen the listener should be able to register the frequency as a result of the source okay very much important ladies and gentlemen so that so that means the source must emit a sound which the listener must register that sound and what do they register ladies and gentlemen we are talking about the frequencies okay

so that means the sound emitted by the source will release certain amount of frequency which is going to be registered by the listener or an observer okay. And again it could be a detector which detects sound very much important ladies and gentlemen that you understand this formula okay so now let's have a look at the information that were given and then from there try to you know substitute into the formula and proceed with our calculations. 

Ladies and gentlemen it's very much important that you fully understand exactly what the question wants you to calculate okay. Remember they want you to calculate the frequency of the sound okay the frequency of the sound that the observer hears most importantly while that train is approaching the observer okay taking into account that the speed of velocity of the sound in air is a 340 meters per second 

okay very much important ladies and gentlemen so that v and that v is the same. Okay in terms of magnitude or in terms of the value okay so ladies and gentlemen can we do it the primary way where we say a given data so we know ladies and gentlemen we've got a frequency let me just say in that order to say frequency of the listener it's equals two then you're able to put a question mark over there because that is exactly what the question wants you to calculate. Okay very much important ladies and gentlemen so now what is that v over there okay then we know ladies and gentlemen excuse me we know v um v refers to the speed of sound in air and is given as 340 a meters per second. 

Very much important ladies and gentlemen that you ride the unis for speed or velocity okay so ladies and gentlemen remember this v is the same v there and there okay so now what is the v of the listener ladies and gentlemen what is the velocity of the listener or velocity of a the observer or the velocity of a detector ladies and gentlemen it doesn't really matter whether it's a detector. 

Whether it's an observer whether it's a listener in this case i'm just saying all of this so that you are aware that it could be a an observer it could be a listener it could be a detector or whatever it could be okay. So we're just trying to explore all the information relevant to this chapter so ladies and gentlemen we know the velocity of the listener is zero meters per second okay why it's because on the statement they said an observer standing on the platform so for that reason it means a the velocity of the listener is zero meters per second.

Because he is standing okay ladies and gentlemen let's now talk about velocity of the source okay v of the source ladies and gentlemen it's very much important that you remember that there we talk about the velocity which is measured in meters per second. Okay so what is the velocity of the source so a source could be an ambulance a source could be a police vein a source could be a train in this case a source could be any moving car a you know emitting sound a source could be anything approaching the listener 

so that means ladies and gentlemen you should be able to find out from the statement which one is the listener and which one is the source okay very much important, ladies and gentlemen that you are able to differentiate between the two okay. So velocity of the source is equals to 20 meters per second very very much important ladies and gentlemen a constant speed of 20 meters per second is the speed at which the source is approaching the observer or the listener okay so ladies and gentlemen what else have we got on the formula remember ladies and gentlemen i'm not referring or asking myself what is it that were given from the statement but instead i'm saying what does the formula have and then from there based on what the formula has i'm just checking through each and every quantity to see if we are given the magnitude of that particular quantity okay 

so now let's talk about a you know frequency of the source okay frequency of the source it's equals two ladies and gentlemen they've just said frequency of the source it's four five eight heads okay four five eight heads ladies and gentlemen that means if a question wants you to calculate the frequency you know your final answer should be in heads okay it doesn't really matter if they are saying the frequency of the listener or the source but for the fact that a question set a frequency then your final answer should be in heads otherwise if it's a velocity ladies and gentlemen. 

If it's a velocity then your answer should be in meters per second okay very very very much important ladies and gentlemen in meters per second so that means on this formula ladies and gentlemen you only have two quantities or two types of quantities which is a the velocity or speed and frequency okay so it's either you calculate the velocity or you calculate the frequency 

ladies and gentlemen please do not be confused by this information so what matters the most is the type of that particular frequency that you'll be calculating is it the frequency of the listener is it the frequency of the source is it the velocity of the listener or is it the velocity of the speed guys guys guys guys guys it's not only the velocity of the listener the velocity of the source frequency of the listener or frequency of the source that the examiner might want you to calculate

very much important ladies and gentlemen they can also want you to calculate the velocity of a you know the the speed of sound in the air okay very very much important that you notice that the speed of the sound in the a ladies and gentlemen um you know it's measured in meters per second why it's because it's a speed it's a velocity okay so guys let's now quickly uh sort out this question...

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