On which factor does the wavelength of light emitted by a LED depend?

The color of light emitted by LED depends on

Observe the following diagram and answer the questions: on which factors does the velocity of the satellite depend ?

a light emitted diode is

If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is

State the factor which controls intensity of light emitted by a LED.

On what factors does the energy carried by a quantum of light depend ?

On what factors does the internal resistance of a cell depend?

On what factors does the retarding potential of a photocell depend ?

On what factors does the frequency of aconical pendulum depends? Is it independent of some factors?

On what factors does the frequency of a conical pendulum depends ? Is it independent of some factors ?