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9h
comment What does ''population'' mean in regards to the excited and ground states of an atom?
The population is just the number of helium atoms in the state
10h
comment What does ''population'' mean in regards to the excited and ground states of an atom?
If $P_0$ is the population of the ground state and $P_1$ is the population of the first excited state it's asking for the ratio $P_1/P_0$.
10h
reviewed No Action Needed Looking out from a collapsing star
10h
reviewed No Action Needed Reattachment of differential equation in Physics
10h
answered Does the stretching of a spring depend on its rest lenght?
11h
answered Why is there pressure difference when the liquid surface is curved?
11h
revised Zero or non zero electrical potential energy of the system
Typo
11h
reviewed Approve Torque Problem (tension and thrust)
11h
comment Torque Problem (tension and thrust)
You've been asked once already. Please don't post your homework questions here.
11h
answered If there is a potential difference between the ends of a battery, does it mean that there is always an electric field?
11h
revised Torque (Distance × MomentArm)
edited tags
12h
comment Torque (Distance × MomentArm)
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
12h
answered Zero or non zero electrical potential energy of the system
12h
revised Solar radiation conversion check
Tweak
12h
revised Solar radiation conversion check
Formatting
12h
comment Adsorption of polar molecules
Clean glass is very polar, and ethanol is reasonably polar so I would expect adsorption of ethanol on glass to be far stronger than say butane on glass. Note however that unless you've used chromic acid on your glass, or plasma cleaned it, the glass surface will be covered in a layer of lipid adsorbed from, well, anything organic in the vicinity including you.
12h
answered Solar radiation conversion check
12h
comment Solar radiation conversion check
PAR = photosynthetically active radiation?
12h
answered Adsorption of polar molecules
13h
reviewed Approve poisson-brackets tag wiki excerpt