Name:_______________________

Quiz 12

12/13/2005

Ch. 29

Useful number(s): c=3.00x10⁸ m/s, h=6.626x10^-34 J·s

1) A beam of electrons hits a double slit with separation 10nm and produces a 3^rd order minimum 1μm above the central maximum on a screen which is a distance 100m away from the slit. What is the momentum of the electrons?

2) A red LED (Light Emitting Diode) emits a 1Watt, 690nm wavelength light beam. The beam shines on a screen. How many photons hit the screen during a 1 second interval?