Define the same radiation ejects electrons from rubidium, Chemistry

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Define the same radiation ejects electrons from rubidium

While 58.4 nm radiation from a helium discharge lamp is directed on a sample of krypton, electrons are evicted with a velocity of 1.59 x 106 m/s. Define the same radiation ejects electrons from rubidium atoms with a velocity of 2.45 x 10^6 m/s. Explain what are the ionization energies in eV of the two elements?

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