Discussion Section Problem

[Allyson Charco Dis1G]

During discussion section we were presented with this problem
We have a frequency of v= 8.7x 10^14 Hz what is the energy? So we would need to first find the wavelength using the formula wavelength x frequency = velocity. Then rearranging the equation so that we can find the wavelength to plug that in to find energy. So velocity/frequency= Wavelength which would be
3.00 x 10^8 ms^-1/ 8.7 x 10^14 Hzs^-1=3.45 x 10^-7
Know that we have the wavelength then we plug it in to the equation but which equation would we use I believe that we were supposed to use E=plancks constant x frequency/ wavelength
Is that not correct? Why not?

[Julia Meno 1D]

I think if you are given the frequency v, you can just use the equation E = hv, which would just be Planck's constant (h) multiplied by 8.7x 10^14 Hz. I don't think you'd even have to do the extra work to find the wavelength but maybe I'm misunderstanding!

[Karan Singh Lecture 3]

I believe Julia is correct. We can simply plug the frequency in to the equation E=hv.

[Asia Yamada 2B]

When you are given the frequency and are asked to find the energy, all you have to do is plug that frequency into the equation, E=hv, where h (Planck’s constant) = 6.63 x 10^-34. When you solved for wavelength and simplified the equation, it resulted in E=h(v/wavelength) which is untrue.

[Sarah Hong 2K]

You are already given the frequency which is 8.7*10^14 Hz. So you just have to plug in the correct values for the equation E=hV. So set h equal to 6.626*10^-34 J.s and V to 8.7*10^14 Hz. Multiply those two numbers together and you will get 5.76*10^-19.

[Chem_Mod]

Hello Allyson,

Please refer to the following equation for the energy quantity: .

While the conversions you provided do offer extra practice for yourself, the equation above would be slightly more efficient. Happy to see all engaging in the discussion!

[Ziyi Meng 2K]

I think you were over-thinking this problem. Since you are given the frequency, you can simply plug it into the E = hv equation to get the energy. Finding the wavelength would be unnecessary work because at the end of the day, you really only need the Planck's constant and the frequency to solve for energy.

[LukeYing_3H]

You have frequency already so just plug it into E=hv with Plank's Constant.

[Jonathan Liu 2I]

I think a more straightforward approach would be to use the equation E=hv and use the frequency given the plancks constant to find the energy.