Which of the following correctly describes isotopes of the same element?

A. Atoms that have the same number of neutrons but a different number of electrons

B. Atoms that have the same number of protons but a different number of neutrons.

C. Atoms that have the same number of protons but a different number of electrons.

D. Atoms that have the same number of neutrons but a different number of protons.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

The speed of light can be used to measure the