The example in the river was to show how sound and light waves might
travel indicating how the doppler effect works. In real life, how does
doppler effect work? Check all boxes that show a situation which would
produce the doppler effect."
-the sound producer is stationary and the observer moves.
-the observer is stationary and the sound producer moves.
-both the observer and the sound producer can move towards or away from each
other
-the observer and the producer move in the same direction at the same speed
-neither observer or producer move, but the producer changes the frequency emitted.
-Other

that would be b i just took the test : )

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!