When tuning a guitar, a musician plays two strings at once. these sound waves overlap and often appear to get louder and softer if the strings are not in tune. this interaction of overlapping waves is called
a) diffraction
b) interference
c) reflection
d) refraction

the answer is a. hope this .

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!