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A string vibrates in 7 segments to a fre...

A string vibrates in 7 segments to a frequency of 210 Hz. The frequency that will cause it to vibrate in 3 segments will be

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Because medium is necessary for the propagation of sound. There is vacuum between the sun and the earth for a very long distance. So, sound waves of the thunders occurring on the sun cannot reach the earth. Thus, we cannot hear the thunders occurring on the sun.
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