Aslit of width a is illuminated by plane waves of light at two wavelengths λ1 & λ2, such that λ1 = 2xλ2. diffraction occurs, giving a pattern of maxima and minima. sketch the intensity distribution of this pattern. in one experiment, the value of a = 0.05 mm. the screen where the pattern is located is at a distance of 2m from the slit. calculate the positions of the first minima for both λ1 and λ2, from the central axis linking the slit to the screen, in the case where λ2 = 300 nm.

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2