Physical Chemistry 2 - Work function - HELP NEEDED

AI Thread Summary
The discussion focuses on solving a problem related to the photoelectric effect, specifically calculating the number of electrons ejected, their energy, and velocity from a laser pulse. The work function of rubidium (Rb) is given as 2.09 eV, and the relevant equations provided include kinetic energy (K.E = hv - work function), velocity (v = speed of light/wavelength), and energy (E = nhv). Participants encourage the poster to apply these equations to find the solution and to share any difficulties encountered. The thread emphasizes the importance of understanding the photoelectric effect in this context.
gunner05
Messages
3
Reaction score
0
I really need help with the following question,

If the work function of Rb is 2.09 eV, what is the number of electrons ejected, their energy in eV, and their velocity, from a microjoule pulse of 500nm laser light?
 
Physics news on Phys.org
This is a standard application of the photoelectric effect - what have you tried so far? What equations do you have that may be useful?
 
I have K.E = hv-(work function)
and v=speed of light/wavelength
E = nhv
 
t!m said:
This is a standard application of the photoelectric effect - what have you tried so far? What equations do you have that may be useful?

I have K.E = hv-(work function)
and v=speed of light/wavelength
E = nhv
 
You have pretty much everything you need then, just plug away. If you get stuck, show us where.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Photoelectric Effect Graph and Work Function Questions
Replies
25
Views
4K
Wavelength-stopping potential dependence
Replies
5
Views
2K
Work function and kinetic energy
Replies
1
Views
2K
Textbook 'The Physics of Waves': Calculating Work Done by Force
Replies
2
Views
822
Work function of cathode, visible light
Replies
2
Views
6K
Calculating energy/work of a quantum
Replies
2
Views
1K
Work function of electrons in a metal
Replies
3
Views
2K
Is the Photoelectric Effect Proof That Light Is a Particle?
Replies
35
Views
3K
Energy window for wien2wannier
Replies
0
Views
2K
How to calculate the work function of a metal?
Replies
8
Views
6K

Hot Threads

Recent Insights

Back
Top