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Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 11 - Dual Nature of Radiation and Matter > Light of frequency 7.21×10^14Hz is incident on a metal surface. Electrons with a maximum speed of 6×10^5ms^−1 are ejected from the surface. The threshold frequency for photoemission of electrons is (Given h=6.63×10^−34Js, me=9.1×10^−31kg)

Light of frequency 7.21×10^14Hz is incident on a metal surface. Electrons with a maximum speed of 6×10^5ms^−1 are ejected from the surface. The threshold frequency for photoemission of electrons is (Given h=6.63×10^−34Js, me=9.1×10^−31kg)

Light of frequency 10^15 Hz falls on a metal surface of work function 3.5eV. The stopping potential of photoelectrons in volts is: