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30.This physical property is an essential for a system to be an oscillating system. A. Its...

30.This physical property is an essential for a system to be an oscillating system.

A. Its temperature is negative.

B. It has a restoring force.

C. It is in free-fall.

D. It is in liquid phase.

31. Consider the electromagnetic spectrum, which includes x-rays, Roy G. Biv and radio waves, and everything else in between x-rays and radio waves.

Question: The shortest wavelengths are at this part of the electromagnetic spectrum:

A. radio

B. Roy G. Biv

C. x-rays

D. seismic

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Answer #1

30. B. It has a restoring force.

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31. C. X - rays

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