A few questions I'm stuck on

Just stuck on a few problems on my homework, any help?

1. How many different sets of quantum numbers are possible for an electron for which:

a) n=1
b) n=2

2. For a hydrogen atom in its ground state, use the Bohr model to compute:

a) the orbital speed of the electron
b) the KE of the electron
c) the electrical potential energy of the atom

3. A monoenergetic bema of electrons is incident on a single slit of width 0.500nm. A diffraction pattern is formed on a screen 20.0cm from the slit. If the distance between successive minima of the diffraction pattern is 2.10cm, what is the energy of the incident electrons?

Thanks for any help you can give!


Staff Emeritus
Science Advisor
Gold Member
Hi there,

For future reference we have https://www.physicsforums.com/forumdisplay.php?f=152" specifically for such questions. Also, according to the rules of the forums (which you have agreed to); you are required to show some effort in solving the problems yourself.

Perhaps if you posted your ideas we could direct you down the right path...
Last edited by a moderator:

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