MYTUTOR SUBJECT ANSWERS

203 views

What is the Doppler Effect?

The Doppler Effect is the strectching and compressing of waves caused by the movement of the source. Put more simply, when an object emits a sound - say a van beeping its horn it produces a sound of a certain frequency. If the van was moving while beeping its horn then the frequency of the sound will be changed relative to an observer (someone watching the van from the pavement). If the van is moving towards the observer then the relative frequency is increased so the pitch of the sound is also increased, while if it's moving away the frequency is decreased. This is caused by the sound waves bunching up in front of the van and stretching out behind the van as each successive wave front is produced at a certain time later, so the van has moved a certain distance and the next wave to be produced is that extra distance closer or further away from the previous wave. Therefore, the waves appear stretched behind and compressed in front of the moving van. 

This can be given in the Doppler Equation:

f' = f( v /v-vs

where f is the frequency of the horn; f' is the observed frequency; v is the speed of sound in air and vis the velocity of the van relative to the observer. 

The Doppler Effect isn't just limited to Sound but can be applied to all waves which means it can give us deep insights about Light, allowing us to have meaningful revelations about the Expanding Universe. 

Sebastian J. A Level Chemistry tutor, GCSE Chemistry tutor, IB Chemis...

6 months ago

Answered by Sebastian, an A Level Physics tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

47 SUBJECT SPECIALISTS

£20 /hr

Alexandra L.

Degree: Aeronautical and Aerospace Engineering (Bachelors) - Leeds University

Subjects offered: Physics, Maths+ 2 more

Physics
Maths
Further Mathematics
Chemistry

“About Me I’m an Aerospace Engineering student at Leeds University. I have long loved tinkering and seeing how things work; to me, science is just the formal extension of this curiosity. Throughout sixth form I helped run the school ...”

MyTutor guarantee

£24 /hr

Rama K.

Degree: MBChB (Bachelors) - Birmingham University

Subjects offered: Physics, Maths+ 5 more

Physics
Maths
English
Chemistry
Biology
.BMAT (BioMedical Admissions)
-Personal Statements-

“I am a passionate medical student who would love to teach the sciences and maths to any willing student! I would also love to help prospective medical students achieve their dreams!”

£20 /hr

Ben A.

Degree: Medicine (Bachelors) - University College London University

Subjects offered: Physics, Maths+ 6 more

Physics
Maths
Chemistry
Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“Hello,I am a first year medical student at University College London, When I was in sixth form, I helped tutor the younger years and I always enjoyed it, so I decided to keep it on in my university years.My subjects are the three m...”

About the author

Sebastian J.

Currently unavailable: for regular students

Degree: Chemical Physics (Masters) - Edinburgh University

Subjects offered: Physics, Maths+ 3 more

Physics
Maths
Chemistry
Biology
-Personal Statements-

“An Introduction to Myself: I am a Chemical Physicist (which means I study Chemistry, Physics and Maths modules) atUniversity of Edinburgh. As well as indulging in Science I also perform poetry, stand-up comedy and love fixing my moto...”

MyTutor guarantee

You may also like...

Other A Level Physics questions

Explain Rutherford's atomic model experiment

What is "half-life"?

If a car is travelling over a curved hill, what is the maximum speed it can travel before losing contact with the road surface?

Two electrons are a distance r apart, the first electron exerts a force F on the second electron. a) What force does the second electron exert on the first? b) In terms of r, at what distance is the force that the first electron exerts on the second F/9?

View A Level Physics tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok