In example 1B.3 on the textbook vers 7 the step 1 to the question is
E = 1/2 * (9.109E-31 kg) * (6.68E5 ms^-1)^2
Where did they get 9.109E-31? I understand 9.109E-31 kg is the mass but I don't know where the number is from.
Example 1B.3
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Andonios Karas 4H
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Re: Example 1B.3
9.109E-31 kg is the mass of one electron, a known quantity through previous experiments. In this experiment, the kinetic energy of the electrons being ejected from the metal by photons is being calculated.
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Leela_Mohan3L
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Re: Example 1B.3
The mass of an electron is provided on the formula sheet that's on Dr. Lavelle's website, and it will be given to us on the test!
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