In a photoelectric emission, electrons are ejected from metals X and Y by light of frequency f. The potential difference V required to stop the electrons is measured for various frequencies.. If Y has a greater work function than X, which graph illustrates the expected results?

Light of 3,000Å is incident on a surface of work function 4 eV . Calculate the potential difference required to stop the photoelectric emission.

When a metal surface is illuminated by a monochromatic light of wave-length lambda , then the potential difference required to stop the ejection of electrons is 3V . When the same surface is illuminated by the light of wavelength 2lambda , then the potential difference required to stop the ejection of electrons is V . Then for photoelectric effect, the threshold wavelength for the metal surface will be

When a metal surface is illuminated by a monochromatic light of wave-length lambda , then the potential difference required to stop the ejection of electrons is 3V . When the same surface is illuminated by the light of wavelength 2lambda , then the potential difference required to stop the ejection of electrons is V . Then for photoelectric effect, the threshold wavelength for the metal surface will be

The threshold wavelength for ejection of electrons from a metal is 430 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 250 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 330 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 230 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 350 nm. The work function for the photoelectric emission from the metal is