Rank the six combinations of electric charges on the basis of the electric force acting on q1. a.
q1 = -1nC
q2= +1nC
q3= +1nC

b.
q1 = -1nC
q2= -1nC
q3= -1nC

c.
q1 = +1nC
q2= +1nC
q3= -1nC

d.
q1 = +1nC
q2= -1nC
q3= +1nC

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db