In case of frequency of light what changes​

Explanation:

It is important to note that while the speed of the light changes when it passes into the new medium, the frequency of the light remains the same. V=frequency× wavelength. As frequency doesnt change so speed and wavelength change to balance the equation. So wavelength changes when it changes the medium.

frequency remains constant when light passes through different mediums . only speed changes and due to it , wavelength also changes. one way of changing the frequency is by Doppler effect, where the apparent frequency changes due to motion of the source ,observer or both of them.

Explanation:

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found in the nucleus

has mass of one amu

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator