Recent content by edwinem

Homework Statement The X-ray spectrum of molybdenum has a particular characteristic spectral line of wavelength 6.6 *10^–11 m. The ionisation energy of molybdenum is 20 keV. Deduce that the energy of an X-ray photon of wavelength 6.6*10^–11 m is 19 keV. Homework Equations E=h*f...

Thanks a lot guys. Your advice was a lot of help.

Yeah I thought about that except that buying different tubes costs too much money. I tried using aluminum foil to see if I could get the same effect but it failed.

Well my changing variable would be the amount of current flowing through the electromagnet. I have a variable resistor and an ammeter. I hook these up in a circuit and then just change the resistance thus changing the current. With different currents the strength of the magnetic field should...

So for a project what I want to do is experiment with dropping a magnet or a piece of metal down a tube and seeing the effect on its falling speed. My first idea is to wrap copper wire around a piece of PVC pipe. I would then hook it up to a battery to make it into an electromagnet. If the field...