Conditions necessary for emission of EMR

AI Thread Summary
The discussion revolves around the necessary conditions for the emission of electromagnetic radiation (EMR). Key points include the requirement of electromagnetic waves, such as light and radio waves, and the role of electric and magnetic fields (EMF) in this process. There is also mention of potential health effects associated with EMR, particularly concerns about its link to cancer, although no definitive proof exists. The participant expresses initial confusion but gains clarity on the topic. Overall, the conversation highlights the importance of understanding EMR and its implications.
desormais
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Homework Statement



Sorry if this is the wrong place, I'm new here but I've been given a little paper to write on electromagnetic radiation. I am having trouble finding what the necessary conditions are for the emission of EMR, and kind of don't understand what it's really asking me for.

thanks in advance.
 
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desormais said:

Homework Statement



Sorry if this is the wrong place, I'm new here but I've been given a little paper to write on electromagnetic radiation. I am having trouble finding what the necessary conditions are for the emission of EMR, and kind of don't understand what it's really asking me for.

thanks in advance.
You need an electromagnetic wave...light, radio waves, microwaves, gamma rays, etc,. and ,in particular , electricity, where the term EMF (electric and magnetic fields) is more commonly used than the term EMR (electromagnetic radiation). Are you being asked to write about EMR and its possible health effects on humans? I'm just guessing, it cause some concern awhile back about causing certain cancers (also cell phone EMR was a concern), none of which has ever been proven, There's probably tons of literature available ..try a Google search.
 
ok, thanks. I understand the question now.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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