Midterm Q3B

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Layla Manoochehri
Posts: 29
Joined: Fri Sep 28, 2018 12:28 am

Midterm Q3B

Postby Layla Manoochehri » Sun Nov 25, 2018 7:56 pm

"Calculate the ionization energy of a rubidium atom, given that radiation of wavelength 58.4 nm produces electrons with a speed of 2450 km/s. Recall that 1 J = 1 kg.m^2.s^-2"

Can anyone show me how to solve this?

Maria Solis Disc 1G
Posts: 63
Joined: Fri Sep 28, 2018 12:27 am
Been upvoted: 2 times

Re: Midterm Q3B

Postby Maria Solis Disc 1G » Sun Nov 25, 2018 10:48 pm

First I used the equation E=hv to find the energy of a photon. Then I used the kinetic energy equation E=(1/2)mv^2 to find the energy of a electron that is released. Then using the concept of conservation of energy I set the initial energy of a photon equal to the sum of the Ionization energy (AKA threshold energy) and Kinetic Energy. I then solved for the ionization energy.

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