## Chem Video Module-test, Joule Conversion

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

### Chem Video Module-test, Joule Conversion

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.
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

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
Been upvoted: 1 time

### Re: Chem Video Module-test, Joule Conversion

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.