Asource of sound is kept in a jar in a vacuum. air is slowly introduced in to the jar. what happens to the sound coming out of the jar? a the loudness of the sound increases gradually. b the loudness of the source decreases gradually. c the sound remains unchanged. d the pitch of the sound increases gradually. e the pitch of the sound decreases gradually.

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

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.

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joke:

h o h o hope you have a merry christmas!