Which best describes a radioactive isotope?

(A) An atom is unstable.

(B) An atom is stable.

(C) There is only one other isotope.

(D) There are many isotopes

A scientist pours 0.120 L of solution A into an Erlenmeyer flask. She adds 2.345 L of solution B. How many significant figures are in the resulting answer?

Two objects with identical charges are placed a distance d from one another. The force between the objects is measured as F. If the distance between the objects is halved, what will the force between them be?

If you know the amplitude of a wave, you know the distance from the crest of one wave to the crest of the next wave. the equilibrium of one wave to the equilibrium of the next wave. the equilibrium of one wave to the crest of the same wave.

Snoopy throws a ball horizontally at 25 m/s from a roof that is 15 m high to hit the cat next door. The ball misses the cat. How far does the ball travel before hitting the ground? How long does it take to hit the ground?

Real world situation to explain the relationship between work and power

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above

You have an open air column of length 1.40 m in air at 24.2 °C. What is the frequency of the third harmonic?