Chem Video Module-test, Joule Conversion

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derinceltik1K
Posts: 51
Joined: Sat Aug 17, 2019 12:15 am

Chem Video Module-test, Joule Conversion

Postby derinceltik1K » Sat Oct 19, 2019 4:18 pm

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1.
Answer the following three questions.
A. What is the kinetic energy of the ejected electron?

How would we solve the question? How to convert kJ to use for the question ?

Trinity Vu 1D
Posts: 53
Joined: Fri Aug 30, 2019 12:15 am

Re: Chem Video Module-test, Joule Conversion

Postby Trinity Vu 1D » Sat Oct 19, 2019 4:39 pm

In order to find the kinetic energy of the ejected electron you would use the equation Ek=1/2mv^2 in which m is the mass of an electron (which you can look up on the constants sheet) and v is the given velocity of the electron.

VPatankar_2L
Posts: 84
Joined: Thu Jul 25, 2019 12:17 am
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Re: Chem Video Module-test, Joule Conversion

Postby VPatankar_2L » Sat Oct 19, 2019 10:31 pm

You can convert the kJ to J by multiplying the energy by 10^3 joules. And the formula for kinetic energy is KE = (1/2)(mv^2) which can be used to solve this problem.


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