Problem 1B.15

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Problem 1B.15

Postby josmit_1D » Sat Oct 19, 2019 1:41 pm

can someone explain how to solve the following problem: 1B.15 The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km?s21. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 3 1016 Hz. How much energy is required to remove the electron from the metal surface? (c) What is the wavelength of the radiation that caused photoejection of the electron? (d) What kind of electromagnetic radiation was used?

Joowon Seo 3A
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Re: Problem 1B.15

Postby Joowon Seo 3A » Sat Oct 19, 2019 2:07 pm

a) Use the DeBroglie equation for this problem since it both relates wavelength and the velocity of an electron.

b)Use the photoelectric equation that relates to the frequency and energy in this case it would be + Kinetic energy but since there is no kinetic energy of an electron the kinetic energy would be zero and you would just have

c) Use the same equation in part b to find the frequency of the radiation. Then use the equation to find the wavelength

d) Look up a chart to find what kind of wave this is

Hope this helps

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