Frequency and Wavelength

[CardiacArrest]

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Alright so I know that from medium to medium, wavelengths change. Greater refraction index, greater wavelength. Denser material, greater wavelength.
But I always read that frequency remains constant. What factors affect frequency?

 

[Bleg]

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[kentavr]

>>What factors affect frequency?
Just to be complete. From MCAT material two more situations may affect observed frequency:
Doppler phenomena and wave superposition(aka beats).

 

[RemyArgo]

Alright so I know that from medium to medium, wavelengths change. Greater refraction index, greater wavelength. Denser material, greater wavelength.
But I always read that frequency remains constant. What factors affect frequency?

i think the variable you're looking for is velocity. freq, in this sit., is constant. increase wavelength, decrease velocity.