Post Assessment Help

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Haley Pham 4I
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

Post Assessment Help

Postby Haley Pham 4I » Sun Oct 13, 2019 9:42 pm

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 10^5 m.s^-1. The work function for sodium is 150.6 kJ.mol^-1. What is the kinetic energy of the ejected electron?
a) 3.01 x 10^25 J
b) 3.98 x 10^-19 J
c) 7.96 x 10^-19 J
d) 1.99 x 10^-19 J
How do you calculate the kinetic energy and what equation would you use?

zachary_nhem_4I
Posts: 57
Joined: Sat Aug 17, 2019 12:18 am

Re: Post Assessment Help

Postby zachary_nhem_4I » Sun Oct 13, 2019 9:45 pm

Kinetic Energy = 1/2 mv^2

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Post Assessment Help

Postby Maia_Jackson_2C » Wed Oct 16, 2019 8:31 pm

But since the question gives you the work function there is another equation that uses both which is
kinetic energy = energy of photon - work function (energy required to remove photon


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