Example 1B.3

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keyaluo4C
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Example 1B.3

Postby keyaluo4C » Tue Oct 16, 2018 9:28 pm

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.

Andonios Karas 4H
Posts: 30
Joined: Fri Sep 28, 2018 12:27 am

Re: Example 1B.3

Postby Andonios Karas 4H » Tue Oct 16, 2018 9:34 pm

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.

Leela_Mohan3L
Posts: 44
Joined: Fri Sep 28, 2018 12:26 am

Re: Example 1B.3

Postby Leela_Mohan3L » Tue Oct 16, 2018 10:29 pm

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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