Ripple Tank Simulation

Description:

The simulation shows a top view of a source (red dot) making waves on the surface of a tank of water. The white circles coming from the spots represent the wave crests with troughs in between. Holding down the mouse in the simulation gives the x, y coordinates of the mouse which will allow you to locate maxima and minima in the simulation.

Question 1:

Add a second source by clicking on the 'Two Sources' button. What causes the dark rows that appear in the simulation? How many lines of constructive interference do you see (not counting the ones going off directly to the left and right)?
Sources:

Question 2:

Suppose instead of a ripple tank this simulation represented two light sources (which have the same wavelength and are in phase- for example laser light going through the two openings of a double slit experiment). The light starts at the bottom of the simulation and reaches a screen at the top edge of the simulation. How many bright spots would be seen on the screen for the two source case?

Question 3:

With two sources use the following buttons to change the wavelength of the sources. How many lines of destructive interference do you see in each case?

Question 4:

If the simulation represented a double slit light source, changing the wavelength would be equivalent to changing the color. Describe the difference in the location of the bright spots for the color represented by wavelength equal to 1 compared to the location of the spots for the color represented by wavelength equal to 2. Do they occur in the same location on the screen (at the top edge of the simulation)? What would be the result on the screen of shining light which was a mixture of these two colors through a double slit?

Question 5:

With two sources and a wavelength of 2.0, use the following buttons to change the distance between the sources. How many lines of destructive interference do you see in each case?