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1. Light of wavelength 401 nm incident on a certain metal produces photoelectrons with a maximum...

1. Light of wavelength 401 nm incident on a certain metal produces photoelectrons with a maximum kinetic energy of 1.78 eV. What is the maximum wavelength of light capable of producing photoelectrons for this metal?

2. Electrons in an electron microscope have been accelerated through a potential difference of 1250 V. How large is their de Brogile wavelength?

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