Craig Van Ness Q&A Thread

[Skyver]

Originally Posted by Master Roshi

I have a question for Craig:

The ejection of electrons from a metal surface by light is called the photoelectric effect. The diagram shows the photoelectric cell and the circuit. A beam of light shines on a metal electrode, K and causes electrons to be ejected from the surface of the metal, which acts as the cathode. The ejected electrons are attracted to the positively charged screen, W connected with the cell through a battery B and a galvanometer, G thus completing the circuit. If the light beam is blocked, the electrical circuit is broken. Given that the metal cathode K is made of tungsten , W, the kinetic energy of the ejected electrons is 8.0 × 10–12 ergs and the wavelength of the incident light is 1.25 × 103 Å, calculate the maximum wavelength of light that could be used to break the circuit. Take the Planck's constant, h = 6.6 × 10–27 erg sec and the speed of light c = 3.0 × 1010 cm sec–1.

What do you think this is? Warhammer? Lol.