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What is the Vmax? the greatest velocity from an electron to emit and does emission occur at wavelength 80nm? If so, what is Vmax of the emitted electrons?

threshold energy for a certain surface is 19.8x10^-19J.
a) If radiation of frequency 6.3*10^15Hz is directed on to this surface, what will be the greatest velocity with which any electron could be emitted?
b) If radiation of the same frequency, but twice the intensity is used, what would be Vmax?
c) If radiation of wavelength of 80nm is used, does emission occur? If so, what is Vmax of the ...

threshold energy for a certain surface is 19.8x10^-19J.
a) If radiation of frequency 6.3*10^15Hz is directed on to this surface, what will be the greatest velocity with which any electron could be emitted?
b) If radiation of the same frequency, but twice the intensity is used, what would be Vmax?
c) If radiation of wavelength of 80nm is used, does emission occur? If so, what is Vmax of the emitted electrons?

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