# Calculating electrons emitted question.

#### ConfusedElect

Hi all, I realise the subsequent question is likely to be quite simplistic; therefore I apologise in advance and I hope I am not offending fellow users. Here’s the question: “How many electrons are emitted from the cathode each second?”
How would I go about answering this question?

I have previous calculated the energy of a photon and the number of photons striking the cathode each second.

Thank you in advance for any help provided :)
CE

Last edited:

#### ConfusedElect

1. The problem statement, all variables and given/known data
Here’s the question: “How many electrons are emitted from the cathode each second?”
How would I go about answering this question?
I have calculated the energy of a photo using E=hf and I also have calculated the number of photons striking the cathode each second.

2. Relevant equations
I am not sure of the equation for this problem as I am unable to locate it in my current Physics literature/I have also been unable to locate a relevant equation on the internet.

3. The attempt at a solution
Would I divide the number of photons striking the metal per second by the charge of an electron? Therefore: (number of photons striking cathode each second)/1.6*10-19...

The numebr I obtain doesn't seem very realistic ;\.

Thank you :).
CE

#### G01

Homework Helper
Gold Member
Do you know the current between the cathode and anode?

Mentor

#### ConfusedElect

Do you know the current between the cathode and anode?
Thank you very much :)!
CE

### The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving