I'm looking at a quizlet with this true or false
t/f higher frequency light always emits electrons with higher kinetic energies
I think it's true but the answer says it's false.
Is this a typo or am I missing something?
Kinetic Energy
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 112
- Joined: Wed Sep 30, 2020 9:51 pm
- Been upvoted: 1 time
Re: Kinetic Energy
I think it might be false just because even if the light has a higher frequency, it might not have enough energy to match the threshold energy?
-
- Posts: 112
- Joined: Wed Sep 30, 2020 9:51 pm
- Been upvoted: 1 time
Re: Kinetic Energy
To add to what I said before, if you make the assumption that the energy of the light matches the threshold energy then, yes I think it's true that increasing the frequency of the light would emit electrons with higher kinetic energy. Perhaps this question does not want you to make that assumption.
-
- Posts: 114
- Joined: Wed Sep 30, 2020 10:01 pm
- Been upvoted: 1 time
Re: Kinetic Energy
True because higher frequency has a direct relationship with kinetic energy, after threshold is met!
-
- Posts: 106
- Joined: Wed Sep 30, 2020 10:01 pm
Re: Kinetic Energy
I think it's false because you're not supposed to assume that the energy of the light is already equal to or greater than the work function. So even if the frequency increases, if the energy is still below that of the work function, no electrons will be ejected. Hope this helps! :)
-
- Posts: 102
- Joined: Wed Sep 30, 2020 10:06 pm
- Been upvoted: 2 times
Re: Kinetic Energy
A higher frequency light would emit electrons with higher kinetic energy if and only if the frequency is already high enough for an electron to be ejected. If not, you can't make that assumption, therefore it would be false.
-
- Posts: 104
- Joined: Wed Sep 30, 2020 9:42 pm
Re: Kinetic Energy
I was thinking that if the light has a higher frequency, the energy emitted would be the same as long as the the energy (frequency) is reaching the energy threshold. The same energy would be emitted that was initially absorbed.
-
- Posts: 114
- Joined: Wed Sep 30, 2020 9:36 pm
Re: Kinetic Energy
Id say its true because with the equation E(photon)-work function=Kinetic energy, the higher the frequency, the larger the energy of photon, so the larger the kinetic energy.
-
- Posts: 50
- Joined: Wed Sep 30, 2020 9:37 pm
Re: Kinetic Energy
According to the equation E(photon)-work function=Kinetic energy, the work funtion is a constant. So the higher frequency, the larger energy of Photo, and thus the larger kinetic energy.
-
- Posts: 49
- Joined: Wed Sep 30, 2020 9:39 pm
-
- Posts: 105
- Joined: Wed Sep 30, 2020 9:50 pm
Re: Kinetic Energy
I feel like that should be true since higher frequency means more energy but maybe it's because the frequency isn't enough to eject the electron. I'm not sure if there were any additional details given in the question.
Return to “Photoelectric Effect”
Who is online
Users browsing this forum: No registered users and 9 guests