Because of the heart beating it makes a thunk noise. Your heart has a suction affect which makes the noise.
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Some examples of electric fields in science are light, X- rays, radio waves, microwaves, etc.
Answer:
It is the distance that light travels in a year.
Explanation:
ASTRONOMY
a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
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