PHYHW5

PHYHW5 - HW5 Problem#4 An experimenter finds that no...

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HW5 Problem #4: An experimenter finds that no photoelectrons are emitted from a particular metal unless the wavelength of light is less than 265 nm. Her experiment will require photoelectrons of maximum kinetic energy 1.9 eV. What frequency light should be used to illuminate the metal? Solution: The problem states that no photoelectrons are emitted for a certain metal unless the wavelength of light is less that 265nm. Therefore this wavelength can be considered the wavelength that corresponds to the threshold frequency 0 f . The threshold frequency can be calculated using equation 3.28: Hz nm c c f 15 max 0 10 1321 . 1 265 × = = = λ The work function is found using: ( 29 ( 29 6819 . 4 6022 . 1 1321 . 1 626 . 6 19 15 24 0 = = = - - J E eV Hz E s J E hf φ Using equation 3.29: ( 29 Hz E J E eV s J E eV eV h KE f 15 19 24 5915 . 1 6022 . 1 626 . 6 9 . 1 6819 . 4 = + = + = - - Problem #6: A photon having 61 keV scatters from a free electron at rest. What is the maximum
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PHYHW5 - HW5 Problem#4 An experimenter finds that no...

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