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Pieces of potassium (Φ = 3.68 × 10–19 J) and sodium (Φ = 4.41 × 10–19 J) metal are exposed to radiation of wavelength 340.0 nm.
Which metal emits electrons with the greater velocity?
What is the velocity of the electrons from potassium?
What is the velocity of the electrons from sodium?

Sagot :

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