How is speed affected of the frequency or wavelength changes?

Answer 1

-- Changing the frequency/wavelength has no effect on the speed.

(Notice that all electromagnetic waves, from wavelengths of perhaps 10-19 meters to

perhaps 1,000 kilometers, travel with the same speed.)

(Also notice that if the baritone sax plays a note together with the female vocalist, then

you hear them at the same time, no matter how far from the stage you're seated.)

-- Changing the frequency causes the wavelength to change, by the same factor

in the opposite direction.

-- Changing the speed causes the wavelength to change, by the same factor

in the same direction.

Answer 2

As frequency increases, speed remains constant in a uniform medium. As wavelength changes, speed can vary in different media (like light in air versus water). However, in a specific medium, speed is usually constant regardless of wavelength changes.