Energy and Momentum of a Photon
 

Energy and Momentum of a Photon problem 6


A metal is irradiated with X-rays. The work function for the electrons of this metal is 9 eV. We measure that the ejected electrons have a speed of 50,000 km/s. What energy do X-rays have? What is the voltage in the X-ray tube to get these rays?


Note that:





 

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