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

When tuning a guitar, a musician plays two strings at once. These sound waves overlap and often appear to get louder and softer if the strings are not in tune. This interaction of overlapping waves is called

An object such as a hammer weights less on the moon than on earth. this is because the moon has a

The sun generates energy through what? a. nuclear fusion b. helium building c. hydrogen synthesis d. atomic separation

When do net force is applied to a moving object it still comes to rest because of its inertia

What is the difference between science and pseudoscience

A galilean telescope adjusted for a relaxed eye is 36cm long. If the objective lens has a focal length of 40cm, what is the magnification?

If a car goes along a straight road heading east and speeds up from 45 ft/s to 60. ft/s in 5 sec, calculate the acceleration

To generate higher profit margins, producers must work to increase their total supply. increase their total expenses. decrease their customer base. decrease their production costs

Solar energy isn't usually used as the only power source for a reason because what

What particle can be stopped by skin