9. If the frequency of a certain light is 3.8 x 10
Hz, what is the energy of this light?

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)

A-of 75 cm by cm by 17.5 cm up. of is 2 kg a , in ,if it is in , kg/?