Which force is always attractive and has a very small range?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

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Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.