We know the famous mnemonic VIBGYOR (Violet-Indigo-Blue-Green-Yellow-Orange-Red) to remember visible light in increasing order of their wavelengths. It is given that (yellow light) does not cause photoelectric effect. This means that

and the energy supplied to the electron is smaller than the work function and hence no electron will come out of the metal. Wavelength of orange light is even greater than the wavelength of yellow light and thus. Therefore, Orange light also does not eject photoelectrons. Wavelength of green light is smaller than the wavelength of yellow light and thus green light may cause ejection of photoelectrons from a metal only if

.