[density of states | the effective masses of electron (m.)and hole (m,') in si at 300 k are known the rest mass of an electron 9.11 0 kg)calculate the effective density of states in the conduction band (n and in the valence band (n,)

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

What is the major limitation to the light microscope?