Metal 1 has a larger work function than metal 2. Both are illuminated with the same short-wavelength ultraviolet light. Do electrons

Question

Metal 1 has a larger work function than metal 2. Both are illuminated with the same short-wavelength ultraviolet light.
Do electrons from metal 1 have a higher speed, a lower speed, or the same speed as electrons from metal 2? Explain.

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Thu Thảo 3 months 2021-08-06T10:02:37+00:00 1 Answers 2 views 0

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    2021-08-06T10:04:33+00:00

    Answer:

    a lower speed

    Explanation:

    Let us look closely at the Einstein’s photoelectric equation;

    KE= E-Wo

    Where;

    KE= kinetic energy of the emitted photoelectron

    E= energy of the incident photon

    Wo= work function of the metal

    Hence,where Wo for metal 1 > Wo for metal 2, it follows that KE for metal 1 must also be less than KE for metal 2.

    This is because the difference between E and Wo for metal 1 is smaller than the same difference for metal 2 hence the answer.

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