Recent content by Zman

Hi, This is from Wikipedia which refers to papers and gravitational redshift in km/s; https://en.wikipedia.org/wiki/Gravitational_redshift Initial observations of gravitational redshift of white dwarf stars A number of experimenters initially claimed to have identified the effect using...

I noticed in physics papers that gravitational redshift is expressed in m/s or km/s. I assume that this must be the equivalent velocity to produce that same redshift. So for example, if the gravitational redshift was measured as 3x10 ↑ -4 then; z= v/c 3x10^-4= v/c v = 9x10^4 m/s v=90km/s...

How do I work out the voltage between two stationary electrons a given distance apart apart? I understand the definition of a volt and I guess that I would need to use Coulomb's law and integrate with respect to distance. It would be great to see the maths though as the answer that I got seemed...

Yes, the lower clock running at half the rate of the clock at infinity will have a larger radius than the lower clock running at a tenth the rate of the clock at infinity. Obvious. Though I need to make a note of how to correctly interpret the equation. Thank you for that.

(Apologies I posted this initially as a conversation. Not familiar with the format) I used the ‘gravitational time dilation’ equation to see how the clock rate varies with distance from the center of an object. I got the opposite result to what I was expecting.From Wikipedia; Gravitational...

Great question. Sometimes it is the questions that are more enlightening than the answers. Although as in QM I think we need to apply some probabilities here. I guess that at such high energies it will be said that there is no uncertainty in the position and momentum of the Hadrons. But I really...

For any others with the same question, the link given above by mfb 'an Insights article' has a couple of sub links which I also found helpful. Thanks

What do ‘events’ refer to when collisions occur at the LHC. The Higgs Boson was found from a blip in the graph of Events vs Energy at about 125Gev. It shows an excess of events at this energy. But what events are in excess and why does this indicate the existence of a particle?

Thank you so much, this grey head is so greatful.

Homework Statement I wish to find the area under the curve y = 1/2^x between x=0 and x=1 but get an answer that is half the expected answer.Homework Equations Integrate y = 1/2^x to get -1/(2^x ln2) + Const This integration result was confirmed on Wolfram Slot in the range x = 0 to x = 1...

A slightly embarrassed thanks. Haven't touched physics for a while.

A neutrino converts a chlorine-37 atom into one of argon-37 A neutrino is also able to react with an atom of gallium-71, converting it into an atom of germanium-71 It looks to me as if the neutrino was changing into a proton in both cases as argon has 1 more proton than chlorine and likewise...

Stretch piece of metal within its elastic limit and it cools down. Does it cool down for the same reason that a gas cools down when expanded? But if the piece of metal is repeatedly stretched and released (like with a spring), I am led to believe that it heats up, although I am not sure. I know...

Our Sun is at least a second generation star. This is known from the heavy metal content of the star. But if a previous star (or stars) existed in the vicinity of our Sun and used up all their hydrogen fuel, where does the hydrogen come from that makes up most of our Sun?

Thanks harrylin What does 'conservation of cycles' refer to in this case? I've never heard of the term but I suspect its what I'm after. Thanks