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An astronaut is conducting experiments on single frozen molecules and atoms in deep space that are far apart.One a nitrogen molecule, one hydrogen,one a lead atom.He is beaming streams of light photons at them.He is able to keep the photons trained on the molecules at all times.
As each photon hits a molecule the astronaut is able to record the status of the molecule. What basic differences will he see in the behaviours of the molecules?
Hi Johann - do you have a link for the experiment? Your description sounds a bit like you have read a (hyped) journalistic write up.
Another (obvious) difference is the recoil of each atom/molecule: H is the lighter (molar mass = 1g/mol) then N2 (MM = 28) then lead (MM = 207). So, using the same frequency of light, the first one will recoil faster, then the second, then the third.
QuoteAnother (obvious) difference is the recoil of each atom/molecule: H is the lighter (molar mass = 1g/mol) then N2 (MM = 28) then lead (MM = 207). So, using the same frequency of light, the first one will recoil faster, then the second, then the third. LightArrow;Ok thanks, this is the type of reply i'm looking for.Would it be possible to predict in what direction the molecules take off in or would it be random? I'm asking this because photons have no mass.
When would they start to move? Would the gas molecules move right away from the first photon even though they are in a frozen state,or would they first spin? Would the lead molecule's electrons jump into new orbits straight away or would it start moving first before that?
that is electromagnetic waves, do have momentum
Quotethat is electromagnetic waves, do have momentumWhy do they have momentum if they have no mass?
Quote from: Johann Mahne on 15/08/2011 16:53:45Quotethat is electromagnetic waves, do have momentumWhy do they have momentum if they have no mass?And why shouldn't they have? Momentum is not m*v. M*v is valid *only* if 2 special conditions are satisfied:1. The object has mass2. Its speed is very little, compared to c.
Yeah. There are a lot of things in the universe that are very small, massless, or are moving very fast. I think the major conceptual breakthrough that started a lot of modern physics was when scientists stopped trying to apply laws that work for every day objects (massive and slow-moving) to these extreme cases and started asking if it were possible that our everyday laws are just a special case of more general laws that also work for extreme cases.
who discovered this new momentum equation?