Why smartwatch has green lights

What is a green house ? Why is air warmer in green that outside ?

If monochromatic red light is replaced by green light the fringe width becomes

Which of the following is/are correct statements? I. The wavelength of red light is greater than the wavelength of green light. II. The wavelength of blue light is smaller than the wavelength of orange light III. The frequency of green light is greater than the frequency of blue light IV. The frequency of violet light is greater than the frequency of blue light

When yellow light is incident on a surface , no electrons are emitted while green light can emit. If red light is incident on the surface , then

If the wavelength of green light is about 5000A^(@) , then the frequency of its wave is

A single slit diffraction pattern is obtained by using a beam of red light. What will happen to the diffraction bands if the red light is replaces by green light?