In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2 10⁻⁷ ~m and stopping potential is 2.5 ~V . The threshold frequency of the metal (in Hz ) approximately (charge of electron e=1.6 10⁻¹⁹ C ,

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In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2 10⁻⁷ ~m and stopping potential is 2.5 ~V . The threshold frequency of the metal (in Hz ) approximately (charge of electron e=1.6 10⁻¹⁹ C , Planck's constant .h=6.6 10⁻³⁴ ~J - s )

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Correct answer: C. 9 10¹⁴

e V₀=h v-h v₀ Threshold frequency, aligned v₀ & =v- e V₀ h & = c - e V₀ h v₀ & = 3 10^8 2 10⁻⁷ - 1.6 10⁻¹⁹ 2.5 6.6 10⁻³⁴ & =9.0 10¹⁴ ~Hz aligned

In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2 10⁻⁷ ~m and stopping potential is 2.5 ~V . The threshold frequency of the metal (in Hz ) approximately (charge of electron e=1.6 10⁻¹⁹ C , Planck's constant .h=6.6 10⁻³⁴ ~J - s )

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