Recent content by giuliopascal

Hi everyone, I have a dispersive wave packet of the form: ##\frac{1}{\sqrt{D^2 + 2i \frac{ct}{k_0}}} e^{-y^2/(D^2+2i\frac{ct}{k_0})}## The textbook says that the enlargement of the package, on the y direction, is: ##L=\frac{1}{D}\sqrt{D^4+4\left(\frac{ct}{k_0}\right)^2} ## However I have some...

Thank you very much. Now I understand a little more :oldsmile:

Hi everyone, searching on the web about how the fluorescent lamps work, I cannot understand if the UV is emitted by the noble gas or the mercury. For what I understand, both of them ionize, and the UV light is emitted after the collision of the electrons with the atoms, but I would like to...

Ok, I think I have taken a few steps forward. I misunderstood which points was the Lorentz equation applied to. I thought there was a time dilatation in ##(T_e,X_e)##, but it is wrong, isn't it? In the Earth reference frame, when the spaceship emits the beam of light the clock time is ##T_e##...

Hi, I am an Italian bachelor student of physics. Nice to meet you!

Homework Statement A spaceship leaves Earth at time ##t=0## with constant speed ##u##. Its clock is synchronized with the terrestrial one. At time T an earthling reads with an optical telescope the clock inside the spaceship. What value does he read? Homework Equations Lorentz equations. The...