Some have images, but the ones that don't are as follows:
Sound waves moves down a hall past an open doorway. Waves of which wavelength would have the hardest time diffracting through the doorway into the room?
A. 5 centimeters
B. 2 meters
C. 100 meters
D. All of the above would easily diffract.
Two point sources are simultaneously creating waves with a wavelength of 6 cm. Point X lies between the two sources. It is 9 cm from one source and 15 cm from the other. What wave heights do you expect at point X?
A. The waves will never get very high or low.
B. The waves may get very high, but will never get very low.

C. The waves may get very low, but will never get very high.
D. The waves will sometimes get very high and very low.
If you have the answers to the whole gizmos, please let me know.