what changes... freq, wave, velocity, intensity

[hospitaldoctor1]

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Sometimes I see that frequency remains the same when light travels from one medium to another... but for sound, velocity remains the same... why?
what changes with different mediums? what remains the same? why?

 

[inaccensa]

Sometimes I see that frequency remains the same when light travels from one medium to another... but for sound, velocity remains the same... why?
what changes with different mediums? what remains the same? why?

This q has come up many times. You can search the forum may be with the term velocity. There are detailed reponses.

 

[hospitaldoctor1]

what should i search for exactly

 

[Charles_Carmichael]

Sometimes I see that frequency remains the same when light travels from one medium to another... but for sound, velocity remains the same... why?
what changes with different mediums? what remains the same? why?

The speed of sound does change if changing mediums. In general, Vsolid > Vliquid > Vgas. This is calculated using the bulk modulus, etc.

 

[hospitaldoctor1]

what stays the same?
why
is it different for light and sound??

 

[inaccensa]

what stays the same?
why
is it different for light and sound??

go to Search this forum (Q&A), type in frequency, velocity, wavelength. I think its worth the effort since there are tons of good responses and they are very thorough. If you want a short answer, Kaushik is correct. The velocity changes in both electromagnetic and longitudinal. In light velocity and wavelength change depending on how the index of refraction for a media changes. Frequency and Energy always remain the same.

 

[hospitaldoctor1]

frequency always remains the same? even for sound?
but isnt that going against the doppler effect

 

[inaccensa]

frequency always remains the same? even for sound?
but isnt that going against the doppler effect

yes it does.
Easier way to think of it is E=hF E is directly proportional to frequency, Since Energy is conserved, so is frequency. What is doppler's effect? What we are talking about is the perceived frequency change.